Granted Patent
Utility
US 4,330,253 · App. 06/187,073
Composite die for forming a plunger for use in a shutoff valve for a medical suction apparatus
Inventor:
Robert L. Nichols
Patented Case
View Patent ↗
Granted: May 18, 1982
Filed: Sep 15, 1980
Inventor
Robert L. Nichols
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.