Granted Patent
Utility
US 5,218,327 · App. 07/675,781
Variable/switchable coupler
Inventor:
Matt Calabrese
Patented Case
View Patent ↗
Granted: Jun 8, 1993
Filed: Mar 27, 1991
Inventor
Matt Calabrese
Assignee (at issue)
Hughes Aircraft Company
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.