Charlie99
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I found a disclosure, but nothing that looked like an application. What are prior art references and your unique claims, and unique advantages?trash:It's a provisional app and you can see a mini version of it at:
I recall seeing a functional equivalent thing for sale a couple of years ago. Since it was just fixed volume ballast tank, it didn't have a piston like yours, and the air bubble would change position as the diver changed attitude. Whether that's good or bad is debateable.
Before you spend much money on a patent application, it would be wise to get info on the earlier device and find out why it flopped. There are lots of patents that don't have much value. In hindsight, most of my patents weren't worth the cost of getting them. The real trick, sometimes, is to figure which ones are worth getting.
Charlie Allen