Granted Patent
Utility
US 4,247,985 · App. 06/054,222
TFL Caliper
Inventor:
William G. Boyle
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Jul 2, 1979
Inventor
William G. Boyle
Assignee (at issue)
Otis Engineering 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.