Granted Patent
Utility
US 4,303,173 · App. 06/054,321
Mug type drinking receptacle with cover and valve
Inventor:
Orv B. Nergard
Patented Case
View Patent ↗
Granted: Dec 1, 1981
Filed: Jul 2, 1979
Inventor
Orv B. Nergard
Assignee (at issue)
Dart Industries 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.