Granted Patent
Utility
US 4,993,144 · App. 07/409,467
Method of making a cyclable electrical switch construction
Inventors:
David T. Llewellyn, William J. Lichtenberger
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Sep 19, 1989
Inventors
David T. Llewellyn
William J. Lichtenberger
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.