Granted Patent
Utility
US 4,220,313 · App. 05/905,246
Valve operator
Inventors:
Kenneth M. Petersen, John E. Soulier
Patented Case
View Patent ↗
Granted: Sep 2, 1980
Filed: May 12, 1978
Inventors
Kenneth M. Petersen
John E. Soulier
Assignee (at issue)
MERCK & CO., 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.