Granted Patent
Utility
US 4,277,964 · App. 06/030,242
Door lock
Inventors:
Elmer R. Crabb, Alta M. Parr
Patented Case
View Patent ↗
Granted: Jul 14, 1981
Filed: Feb 15, 1979
Inventors
Elmer R. Crabb
Alta M. Parr
Assignee (at issue)
Caterpillar Tractor Co.
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.