Granted Patent
Utility
US 4,371,833 · App. 06/158,658
Speed switch
Inventor:
William J. Roberts
Patented Case
View Patent ↗
Granted: Feb 1, 1983
Filed: Jun 11, 1980
Inventor
William J. Roberts
Assignee (at issue)
Eltra 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.