Oct 30, 2026 · 19 min
Survivor turns fishing pain into a patented product
How a Brain Tumor Survivor Became a Patented Inventor
John Pat McGreevy’s story shows how a painful fishing problem became a protected, manufactured product through hands-on experimentation and persistence.
- 1John Pat McGreevy developed the T-butt after repeated bruising while fighting large fish offshore.
- 2He built the first prototype in his garage, then secured a utility patent after a 14-month research and legal process.
- 3Boat shows, distributors, and industry events helped move the T-butt from local invention to international markets.
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McGreevy describes returning from a bruising three-day fishing trip and using his garage workshop to build the first T-butt prototype.
The brief
John Pat McGreevy connects two forms of reinvention: surviving a major brain tumor and turning repeated offshore-fishing bruises into a product idea.
After a three-day trip to Florida’s Middle Grounds, McGreevy returned to his garage and built the first T-butt prototype with tools and materials at hand.
The cushioned accessory slides onto a fishing rod’s bottom, distributing pressure more comfortably than a conventional belt or bracing the rod against the body.
A 14-month patent process, injection-molding hurdles, and early boat-show sales tested whether a practical garage invention could become a viable business.
The T-butt reached distributors in the United States and Europe, while a Shark Tank tryout marked another step in McGreevy’s push toward international growth.
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