Granted Patent
Utility
US 4,099,642 · App. 05/856,390
Drinking receptacle cover and valve assembly
Inventor:
Orv B. Nergard
Patented Case
View Patent ↗
Granted: Jul 11, 1978
Filed: Dec 1, 1977
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.