Granted Patent
Utility
US 4,152,950 · App. 05/795,534
Differential and push-pull control system
Inventor:
William D. Langford
Patented Case
View Patent ↗
Granted: May 8, 1979
Filed: May 10, 1977
Inventor
William D. Langford
Assignee (at issue)
Incom International, Inc.
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.