Granted Patent
Utility
US 4,237,936 · App. 05/910,432
Pig trap closure
Inventors:
Jack D. Lollis, David J. Hicks
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: May 30, 1978
Inventors
Jack D. Lollis
David J. Hicks
Assignee (at issue)
T.D. WILLIAMSON
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.