Blockchain Patent Invalidation Search: Priority Filing Case

PROBLEM STATEMENT

The Client’s Challenge

A client required prior-art research for a patent involving blockchain-based payment processing and token generation.

At a high level, the claimed process connected conventional payment processing with blockchain-based record keeping. A payment transaction containing information such as payer or payee details, transaction amount and payment purpose was processed by a bank database. The database generated an enriched representation of the transaction, incorporating additional organization or classification attributes.

The challenge in this investigation was determining whether the specific combination of payment processing, enriched transaction records, token generation and blockchain-based identification for future verification or audit had already been disclosed before the subject patent’s August 2015 cutoff.

The investigation focused on the combination of:

- Payment transaction information processed through a bank database
- Generation of an enriched transaction data record
- Recording of the enriched record on a blockchain or distributed ledger
- Storage or association of the token with the blockchain record
- Subsequent identification, verification, retrieval, analysis, or auditing of the historical transaction

CLIENT’S OBJECTIVE

Determine whether the claimed payment-processing workflow had been disclosed in pre-August 2015 prior art with particular emphasis on finding evidence that captured the novel combination rather than isolated elements.

Traditional Prior Art Search Approach

The investigation initially followed a conventional patent-search workflow. The first stage focused on identifying terminology directly associated with the claimed technology and then expanding the search through relevant patent classifications, known players and related financial technology concepts.

Conventional Investigation Strategy

keyword and synonym combinations

Review relevant patent families

Examine financial technology disclosures

Identify blockchain-related payment systems

Screen references against the August 2015 cutoff

The initial search produced several technically interesting references. However, the individual disclosures did not initially converge on the specific combination being investigated.

Traditional Prior Art Search Workflow

Technology & Claim Concept Extraction

Break down the payment and blockchain claim elements
Identify key components and their interactions
Define the token's intended technical function

Keyword & Synonym Search

Identify blockchain, payment, and token keywords
Develop historical and technical synonyms
Run Boolean and combination-based queries

Patent Classification & Database Search

Search relevant CPC/IPC classifications
Screen patents for technical relevance
Review related patent families

Blockchain and Payment Token Search

Search blockchain and distributed-ledger disclosures.
Identify payment token generation mechanisms.
Examine intended token technical purposes.

Technical Disclosure Review

Review claims, descriptions, and figures.
Extract relevant technical disclosure evidence.
Identify missing claim elements clearly.

Multi-Reference Mapping and Assessment

Map claim elements across references
Identify complementary technical disclosures
• Assess remaining disclosure and evidence gaps.

Critical-Date and Priority Verification

Apply the August 2015 cutoff.
Verify publication and priority dates.
Trace earlier priority document disclosures.
Review relevant assignee portfolios.

Outcome: Identify a technically relevant pre-August 2015 disclosure and determine whether the claimed payment-token-blockchain workflow was previously disclosed.

Limitations of Traditional Approaches

Blockchain terminology was not consistently standardized.
Relevant concepts could be described without explicitly using the term “blockchain.”
Payment tokens had multiple meanings and use cases.
Blockchain references did not necessarily disclose the token-generation workflow.
Relevant disclosures appeared in fragments across different references.
Later-published documents could obscure earlier priority disclosures.
Literal keyword searching risked excluding technically relevant terminology.

Several references discussed token generation in payment environments. Yet the purpose of those tokens was different. They were associated with gift vouchers, virtual currency, offers, or similar applications rather than serving as identifiers or pointers for blockchain-recorded transaction data.

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Wissen’s Out-of-the-Box Approach:

Functional Prior Art Through Concept and Patent-Family Analysis

Recognizing the limitations of conventional terminology-based searching, the strategy evolved beyond traditional keyword and documentary prior art analysis.
To enable a broader and more technically grounded assessment of prior art evidence, the investigation expanded beyond a sole focus on documents explicitly mentioning “blockchain” or “payment tokens” to include functionally similar financial transaction and distributed-record systems that were:

Publicly available before the August 2015 cutoff date
Related to blockchain or distributed transaction-record technologies
Relevant to payment processing and transaction identification

Identifying Relevant Functional Prior Art

A focused technical investigation was conducted on financial technology and blockchain-related patent disclosures relevant to the period before August 2015.
However, the available references did not initially disclose the complete technical relationship required for the investigation.
To overcome this limitation, the investigation expanded beyond literal terminology and focused on the underlying technical purpose of the token and the historical development of blockchain-related terminology.

Our Methodology

Traditional Search Limitations

Conventional keyword searching produced fragmented disclosures
Blockchain terminology was not consistently standardized before 2015
Token mechanisms were disclosed for purposes unrelated to transaction verification
Several technically relevant results appeared after the August 2015 cutoff date

Identification of Relevant Financial Technology Concepts

Identify financial and payment systems relevant to the claimed workflow
Focus on transaction-recording and distributed-ledger architectures
Evaluate the technical purpose of generated tokens or identifiers
Examine their relevance to transaction identification and future verification

Alternative Terminology and Concept-Based Searching

Expand beyond the term “blockchain”
Identify alternative descriptions for tokens and transaction identifiers
Search the functional relationship between transaction records and unique identifiers

Pre-Cutoff Date Investigation

Focus on evidence relevant to the pre-August 2015 period
Identify technically relevant disclosures within the required timeline
Distinguish publication dates from earlier priority dates
Evaluate potentially relevant patent-family histories

Assignee and Patent Portfolio Analysis

Identify major players active in blockchain-related technologies
Analyze relevant patent portfolios
Search technology disclosures based on the problem and solution addressed
Review related patent families and citations

Patent-Family and Priority Application Analysis

Identify later-published documents disclosing relevant technical workflows
Trace documents back to their earliest priority applications
Verify whether the relevant technical disclosure existed before August 2015
Examine the priority application for supporting evidence

Claim Mapping Against Prior Art Disclosure

Map the identified payment and token workflow against the relevant claim limitations
Document the relevant technical disclosures
Prepare evidence supporting the client’s invalidation analysis

Outcome:

A potentially relevant patent-family disclosure with an earliest priority application filed before August 2015 was identified, providing evidence relating to the payment-token and blockchain workflow under investigation and strengthening the client’s patent invalidation analysis.

Prior Art Investigation Methodology

The investigation involved a structured and iterative analysis of patent literature and related patent families to identify disclosures relevant to blockchain-based payment processing and token generation before the August 2015 cutoff date.

Prior art in blockchain investigation image

The investigation ultimately revealed that relevant evidence could be identified by looking beyond conventional blockchain terminology and tracing technically relevant disclosures back to their earlier priority applications.

Most importantly, the findings demonstrated that a later-published patent document could lead to a relevant pre-August 2015 priority disclosure, strengthening the evidence available for the client’s patent invalidation analysis.

Evidence Collection & Validation

The discovery required more than identifying a technically similar later publication. The validation process therefore followed the patent-family timeline back to the earliest identified priority filing.

Technical correspondence

Date verification

Priority-document examination

Claim-level mapping

Cross-checking

This distinction between publication date and priority disclosure was central to the investigation.

Technical Challenges Addressed Through the Investigation

Challenge 1: Identifying the Relevant Blockchain Technology Before the Critical Date

One of the primary challenges involved identifying technically relevant blockchain disclosures published or otherwise traceable to the period before the August 2015 cutoff date. In addition, several technically relevant results identified during the initial search were published after August 2015.

Solution

The investigation expanded beyond conventional blockchain terminology and incorporated alternative technical expressions used to describe similar concepts. The search strategy included terminology associated with distributed and linked transaction records, including “distributed ledger,” “digital ledger,” “hash chain,” “hash tree,” “ledger chain,” “title chain,” “public ledger,” and “chain of transactions.” The investigation also applied the August 2015 date as a critical screening criterion and examined the historical timelines of promising patent families.

The analysis revealed:

Alternative blockchain-related terminology
Earlier linked transaction disclosures
Historical FinTech terminology variations
Patent family timeline analysis

These findings demonstrated that the absence of the word “blockchain” did not necessarily indicate the absence of blockchain-related technical functionality.

Challenge 2: Identifying Pre-August 2015 Evidence Hidden Within a Later-Published Patent Family

A further challenge involved evaluating a highly relevant technical disclosure that initially appeared to fall outside the required timeframe. During the investigation, a patent result was identified that disclosed technical concepts closely corresponding to the target payment architecture, including requesting a payment token, generating a payment token through a token-related module, associating payment-token information with a blockchain and recording token-related information in connection with a payment transaction

Solution

The patent-family timeline was traced to identify the earliest priority application associated with the later-published document. This analysis identified an earliest priority application filed in January 2015, before the August 2015 cutoff date. The priority application was then examined to determine whether the relevant technical disclosure was present in the earlier filing.

The analysis revealed:

Later publication with relevant concepts
January 2015 priority application
Relevant disclosure in priority filing
Pre-August 2015 patent timeline

This finding directly addressed one of the most significant challenges in the project: a technically relevant result should not always be excluded simply because the publication date falls after the critical date.

Results & Business Impact

The investigation ultimately identified a patent-family disclosure that closely corresponded to the payment-token-blockchain workflow under investigation.

Key Outcomes

Search the technology as it was described historically, not only as it is described today.
Distinguish a token’s function from the generic concept of tokenization.
Treat publication date and priority date as separate investigative questions.
Use assignee and patent-family analysis when conventional keyword searches plateau.
Map the technical relationship between claim elements rather than searching for isolated features.
Use iterative search strategies when early evidence appears only in fragments.

Strategic Business Impact

By moving beyond conventional keyword-based prior art searching and incorporating functional terminology analysis, assignee-focused searching, and patent-family timeline investigation, the project provided:

Broader prior art coverage
Improved historical disclosure identification
Stronger invalidation evidence support
Reduced overlooked evidence risk
Improved functional analysis confidence
More efficient emerging technology investigations

The approach demonstrated how combining technical concept analysis with historical terminology and patent-family investigation can uncover potentially relevant prior art that may remain undiscovered through conventional keyword-based search methodologies alone.

Conclusion & Implications

This case study highlights the importance of adopting broader and more adaptive prior art investigation strategies in emerging technology patent invalidation projects.
Traditional keyword and patent database searching remains valuable for identifying foundational disclosures. However, rapidly developing technologies such as blockchain often present a significant terminology challenge. Concepts that are now commonly described as “blockchain,” “distributed ledger,” or “tokenization” may have been described differently in earlier technical and patent literature.
In this investigation, conventional searching initially identified relevant pieces of the technology, including payment processing systems, token generation mechanisms, and blockchain-based financial transaction records. However, the required technical relationship between these elements remained fragmented across multiple references.
By expanding the investigation beyond conventional terminology and focusing on the functional purpose of the claimed components, the project identified new search pathways. Alternative terms associated with distributed record systems were examined, while the role of the token was evaluated not merely as a payment instrument but as a mechanism for identifying, linking, or verifying transaction information at a later stage.
The investigation further demonstrated the importance of examining patent-family timelines. A highly relevant result initially appeared to fall outside the critical pre-August 2015 period because of its later publication date. However, tracing the document back to its earliest priority application revealed a January 2015 filing containing the relevant technical disclosure.

Could an Earlier Priority Filing Change a Blockchain Patent Invalidation Search?

The Client’s Challenge

Traditional Prior Art Search Approach

Conventional Investigation Strategy

Traditional Prior Art Search Workflow

Technology & Claim Concept Extraction

Keyword & Synonym Search

Patent Classification & Database Search

Blockchain and Payment Token Search

Technical Disclosure Review

Multi-Reference Mapping and Assessment

Critical-Date and Priority Verification

Wissen’s Out-of-the-Box Approach:

Identifying Relevant Functional Prior Art

Our Methodology

Prior Art Investigation Methodology

Evidence Collection & Validation

Technical Challenges Addressed Through the Investigation

Results & Business Impact

Key Outcomes

Conclusion & Implications