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Life & fun · January 3, 2017

EI

Explore ideas whose patent protection expires today

In plain words

This website helps users discover ideas and innovations whose patent protection expires on any given day. It's designed for inventors, entrepreneurs, students, and anyone interested in patent law and available intellectual property. The tool provides a unique angle on innovation by highlighting patents transitioning into the public domain, making previously protected technologies and designs available for anyone to use or build upon.

written from the facts on this page · September 2026

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  • Hi HN, I built Eigendrum, a web tool that solves the 2D wave equation for arbitrary shapes so you can hear what they sound like as drums. How it works: * Solves -∇²u = λu using finite element analysis (Kφ = λMφ) on a triangle mesh. * Validated to <0.1% error against closed-form solutions for circles (Bessel zeros) and rectangles. * Sound model factors in strike location, Rayleigh damping, and mallet width. * Includes Kac drums I & II to demonstrate identical sound spectra from different geometries. * No frameworks, build steps, or dependencies. Repo and tests:…

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Launched alongside, January 2017

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