Value Delivered
GreyB identified a single, claim-complete prior art reference for a welding machine’s current-limiting circuit. This significantly strengthened the client’s defence and helped avoid nearly $3 million in litigation costs.
Problem Solved
The client was facing a patent assertion related to a welding machine current-limiting circuit. Existing patent literature identified only partial solutions, mainly focused on limiting output welding power based on machine efficiency. However, this literature did not address real-time source voltage fluctuations. It also failed to consider maximum source current capacity, which was central to the disputed claims.
From a research perspective, conventional IPC-based searches and problem-statement approaches were explored. Non-patent literature, including research papers and technical forums, was also reviewed. These sources provided fragmented insights but did not reveal a single reference that solved the operational halt issue during voltage drops.
Solutions Offered
The team deployed a multi-layered prior art strategy spanning IPC/CPC searches, image-based circuit analysis, forums, research papers, and product manuals. Non-English patent literature, particularly foreign-language filings, were prioritized. Results were rigorously filtered for claim completeness to eliminate dependence on multi-reference combinations.
This approach led to the identification of a high-value Chinese patent reference. The equation implicitly covered all disputed elements, real-time source voltage, maximum source current, output welding current, and machine efficiency. This enabled the team to deliver litigation-ready evidence for invalidity.
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