Patent Invalidation Search for Medical Device Prior Art

PROBLEM STATEMENT

The Client's Challenge

The client required a patent invalidation assessment for a walk-to-work system designed to facilitate the transfer of personnel and equipment between a ship and a wind turbine. The claimed technology combined a gangway system with a height-adjustable pedestal and an elevator system incorporating a height-adjustable elevator.

The challenge was to identify prior-art evidence that could address the novelty of this specific technical combination. Initial searching revealed references covering the individual elements, but no single reference had been identified that brought the critical features together.

The investigation focused on the technical concepts represented by the subject invention:

- Walk-to-work systems for ship-to-wind-turbine transfer
- Gangway systems with height-adjustable pedestals
- Height-adjustable elevator systems
- Integrated personnel and equipment transfer mechanisms
- The combination of adjustable gangway support and elevator functionality

CLIENT’S OBJECTIVE

Identify prior art relevant to the claimed walk-to-work system for transferring personnel and equipment between a ship and a wind turbine.

To find a reference disclosing the combined configuration of a height-adjustable gangway pedestal and a height-adjustable elevator within a single system.

Traditional Invalidation Search Approach

The investigation followed a conventional invalidation approach by mapping the walk-to-work system’s key technical elements to relevant keywords, classifications and patent literature, including:

Conventional Investigation Strategy

Subject patent & claim analysis

Keyword & synonym searches

Classification-based searches

Assignee & inventor searches

Citation analysis

Patent & non-patent literature review

The search identified references disclosing a height-adjustable pedestal with a lifting mechanism and separate references covering height-adjustable elevator systems. However, no single reference was initially identified that disclosed the required combination of these features.

Traditional Invalidation Search Workflow

Subject Patent & Technology Analysis

Review walk-to-work system
Identify key claim elements
Analyze gangway, pedestal & elevator

Search Strategy Development

Map keywords & synonyms
Apply broad & narrow searches
Use relevant classifications

Prior-Art Identification

Search patent databases
Review non-patent literature
Identify relevant prior art

Prior-Art Screening & Relevance

Screen technical relevance
Assess disclosure of key features
Shortlist relevant references

Claim Element & Combination Analysis

Identify pedestal disclosures
Identify elevator disclosures
Assess feature combination

Outcome: Conventional searches found the key features separately but missed a single reference combining the height-adjustable pedestal and elevator to challenge novelty.

Limitations of Traditional Approaches

Key features were found in separate references.
No single reference disclosed the complete combination.
Searches remained focused on gangway and offshore applications.
Other industries with similar engineering systems were not initially explored.
Further searching within the same domain produced limited results.

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Wissen’s Out-of-the-Box Approach:

Expanding the Search Beyond the Walk-to-Work Application

Recognizing that conventional searches were not revealing the required feature combination, the investigation expanded beyond the offshore wind and gangway domain to identify similar engineering configurations in other application areas.
The search focused on applications involving:

Height-adjustable structures and platforms
Lifting and elevator mechanisms
Bridges for personnel or equipment transfer
Industrial and construction access systems

Identifying the Missing Technical Combination

The broader search led the team to explore non-patent technical sources, including videos from alternative application fields. During this investigation, a reference was identified showing a height-adjustable tower with a lift connected to a bridge.
This disclosure provided the missing technical combination that had not been identified through the conventional gangway-focused search, making it highly relevant for the patent invalidation assessment.

Our Methodology

Subject Patent Analysis

Review patent and claims
Identify key technical elements
Understand system architecture
Define search concepts

Technology Analysis

Analyze gangway configuration
Examine pedestal mechanism
Study elevator system
Map component relationships

Patent Search

Develop keywords and synonyms
Search relevant classifications
Analyze assignees and inventors
Review citations and families

Non-Patent Literature Search

Search technical publications
Review industry literature
Explore technical videos
Assess relevant disclosures

Cross-Application Search

Expand beyond offshore applications
Explore industrial applications
Investigate construction systems
Identify comparable configurations

Reference Analysis

Review identified disclosures
Compare technical features
Assess feature combinations
Evaluate claim relevance

Evidence & Reporting

Validate key technical findings
Map evidence to claims
Document supporting references
Compile the invalidation report

Invalidation Investigation Methodology

The investigation involved a structured patent analysis methodology designed to identify relevant prior-art references for the Walk-to-Work System.

The investigation expanded beyond conventional gangway and offshore-focused searches into alternative applications and non-patent sources.

This broader approach identified a highly relevant reference disclosing a height-adjustable tower, lift and bridge configuration aligned with the key elements of the Walk-to-Work System.

Evidence Collection & Validation

To establish the relevance of the identified reference, the investigation used multiple technical and evidence-validation approaches, including:

Technical disclosure and claim-element analysis

Reference source and publication-date verification

Feature-to-reference mapping

Cross-checking the disclosed system configuration

This validation assessed the identified reference for technical relevance and alignment with the key elements of the Walk-to-Work System, providing a clear basis for its inclusion in the patent invalidation report.

Technical Challenges Addressed

Challenge 1: Identifying a Single Reference With the Required Technical Combination

A key invalidation challenge was identifying prior-art evidence disclosing the specific combination of a height-adjustable pedestal connected to a gangway and a height-adjustable elevator within a Walk-to-Work System.

Solution

The investigation decomposed the claimed system into its individual technical elements and conducted targeted searches across patent and non-patent sources. The analysis separately evaluated gangway, pedestal, lifting, and elevator configurations before assessing whether the features were disclosed together.

The investigation identified:

Height-adjustable gangway pedestal configurations
Integrated lifting and equipment-transfer mechanisms
Height-adjustable elevator systems
Gangway and bridge-based transfer arrangements

These findings established that the critical features existed in the prior-art landscape but were not initially identified together in a single disclosure.

Challenge 2: Overcoming the Limitations of Domain-Focused Searching

Another key challenge was that conventional searches remained concentrated on offshore wind and Walk-to-Work applications, limiting the ability to identify equivalent engineering configurations used in other industries.

Solution

The investigation expanded beyond the specific application field and explored alternative industries where similar height-adjustable structures, lifts and bridge-based transfer systems could be used. Non-patent sources, including technical videos were also reviewed to identify relevant system configurations.

The investigation identified:

Alternative industrial applications of gangway-like systems
Height-adjustable tower and platform configurations
Lift mechanisms connected to bridge structures
Non-patent technical evidence from other application fields

This broader technical perspective enabled the team to identify evidence that was not apparent through conventional Walk-to-Work-focused searching.

Results & Business Impact

The investigation identified a highly relevant technical reference addressing the key elements of the Walk-to-Work System, including a height-adjustable structure, lift and bridge configuration. The finding strengthened the evidence base for assessing the patent’s novelty and potential invalidation.

Key Outcomes

Identified a highly relevant technical reference.
Mapped disclosure against key claim elements.
Identified a height-adjustable tower and bridge-connected lift.
Expanded the search to non-conventional offshore applications and NPL.
Incorporated findings into the invalidation report.

Strategic Business Impact

The investigation demonstrated that complex patent invalidation searches can require looking beyond the specific application field of the subject patent. A broader technology-focused approach provides:

Greater opportunity to identify relevant prior-art evidence.
Improved ability to uncover equivalent engineering configurations.
Reduced dependency on application-specific search terminology.
Stronger evidence for assessing potential patent vulnerability.
Greater confidence in the technical relevance of identified references.

A reference may appear unrelated when viewed only through its application area. However, when its underlying engineering configuration matches the claimed technology, it can become highly relevant to a patent invalidation assessment.

Conclusion & Implications

This case demonstrates how a structured patent invalidation investigation can uncover highly relevant technical evidence when conventional searches do not identify the required combination of claim elements.
The Walk-to-Work System combined a height-adjustable gangway pedestal and height-adjustable elevator, making application-specific searching insufficient to identify a single relevant disclosure.
By decomposing the claimed technology, conducting targeted patent and non-patent searches, and expanding the investigation into alternative application fields, the team identified a height-adjustable tower and lift connected to a bridge that closely aligned with the key technical elements.
The project reinforced several principles:

Analyze inventions through individual technical elements.

Look beyond the patent’s stated application field.

Explore equivalent configurations across industries.

Combine patent and non-patent evidence to validate key claim elements.

Could Looking Beyond Offshore Applications Unlock Critical Prior Art?