Granted Patent
Utility
US 5,291,056 · App. 08/007,949
Electronic switch comprising a photosensitive semiconductor
Inventor:
Peter Howson
Patented Case
View Patent ↗
Granted: Mar 1, 1994
Filed: Jan 26, 1993
Inventor
Peter Howson
Assignee (at issue)
Cooper Industries Holdings
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.