Granted Patent
Utility
US 5,138,832 · App. 07/585,324
Solar thermal propulsion engine
Inventor:
John B. Pande
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: Sep 18, 1990
Inventor
John B. Pande
Assignee (at issue)
HERCULES LLC
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.