Patent Watch Turns Idle IP Portfolios Into Revenue With AI Infringement Detection
For most companies, patents are an expensive line item that quietly accrues legal fees and rarely earns its keep. Filing and maintaining a single patent over its lifetime can run up to $50,000, yet once a patent is granted, it usually sits untouched in a corporate vault. Patent Watch, a Y Combinator Fall 2025 startup, wants to change that – by using AI to find every product on the market that may be infringing.
Founded in 2025 by brothers Alexander and Andreas Stroe, Patent Watch automates the most tedious and high-stakes corner of intellectual-property work with AI patent analysis software – reading patents, mapping their claims to real-world products, and producing the claim charts that lawyers and licensing teams need to act. The software interprets patent language, identifies competing products, and generates side-by-side analyses showing who is infringing and how. According to the company, customers can begin turning a dormant portfolio into revenue in as little as 10 minutes.
The use cases span the entire IP value chain. Teams use Patent Watch to find licensing and litigation targets, draft cease-and-desist letters, identify counter-litigation strategies, monetize patents during corporate wind-downs, and accelerate M&A diligence by quickly evaluating the strength of a target’s portfolio. The platform also runs AI-driven invalidity and prior-art searches, helping rights-holders harden their patents to withstand challenges in court.
The founders bring an unusual combination of backgrounds. Alexander Stroe previously day-traded funded accounts and spent more than a million dollars on advertising – experience that translates directly into the kind of conversion-focused, ROI-driven product thinking that legal-tech buyers respond to. Andreas Stroe was a researcher at Philips before joining his brother to build Patent Watch. Together they’re applying modern AI to a corner of the legal industry that has long resisted automation.
The market timing is sharp. Generative AI has dramatically lowered the cost of reading and reasoning about long, technical documents – exactly the bottleneck that historically made patent enforcement so expensive. Law firms have charged hundreds of thousands of dollars for the kind of infringement analysis Patent Watch can now produce in minutes, putting enforcement within reach of smaller IP holders, corporate development teams, and bankruptcy trustees who previously had to leave value on the table. With litigation funders, sovereign wealth funds, and private-equity firms increasingly treating patents as an investable asset class, the appetite for fast, defensible infringement analysis is growing rapidly.
The company positions itself in a competitive but underbuilt corner of legal tech, with tags spanning Artificial Intelligence, SaaS, B2B, Legal, and LegalTech. While established patent-search platforms address discovery and prior art, Patent Watch’s wedge is enforcement: turning a granted patent into a revenue-producing asset, not just a defensive moat. If that bet pays off, the long-term implication is significant: a world in which the patent system actually rewards inventors and rights-holders, and in which the gap between filing a patent and benefiting from one shrinks from years to minutes.