Granted Patent
Utility
US 4,303,520 · App. 06/163,880
Surface extraction apparatus
Inventor:
Leslie S. Wirt
Patented Case
View Patent ↗
Granted: Dec 1, 1981
Filed: Jun 27, 1980
Inventor
Leslie S. Wirt
Assignee (at issue)
Lockheed Corporation
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.