Granted Patent
Utility
US 4,896,721 · App. 07/322,906
Locator shifter tool
Inventor:
William R. Welch
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Mar 14, 1989
Inventor
William R. Welch
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.