The U.S. Government’s Secret Inventions

If you look through the U.S. Patent Office’s online database, you’ll find some head-scratching proposals for inventions: for a plan to stack airplane passengers on top of one another, for the process of taking a picture of something on a white background, for chocolate-covered ice-cream bars.

https://slate.com/technology/2018/05/the-thousands-of-secret-patents-that-the-u-s-government-refuses-to-make-public.html