Granted Patent
Utility
US 4,233,977 · App. 05/974,275
Closure means for collection appliances
Inventor:
Larry J. Mattson
Patented Case
View Patent ↗
Granted: Nov 18, 1980
Filed: Dec 28, 1978
Inventor
Larry J. Mattson
Assignee (at issue)
Howmedica 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.