Granted Patent
Utility
US 4,385,580 · App. 06/243,088
Marine door unit
Inventor:
Samuel L. Davidson
Patented Case
View Patent ↗
Granted: May 31, 1983
Filed: Mar 12, 1981
Inventor
Samuel L. Davidson
Assignee (at issue)
Mastercrafters 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.