U.S. Patent No. 836,466

A 3D model of [U.S. Pat. No. 836,466](https://www.google.com/patents/US836466). Cutting edge 1906 self-measuring bottle technology from the original database of things--the U.S. PTO.

And the '221 Patent isn't the first patent on this idea. Take a look at [U.S. Pat. No. 236,997](https://www.google.com/patents/US236997) for prior art!

More available [here](http://patent-able.tumblr.com)!