Granted Patent
Utility
US 5,303,552 · App. 07/909,212
Compressed gas buoyancy generator powered by temperature differences in a fluid body
Inventor:
Douglas C. Webb
Patented Case
View Patent ↗
Granted: Apr 19, 1994
Filed: Jul 6, 1992
Inventor
Douglas C. Webb
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.