Granted Patent
Utility
US 4,213,457 · App. 05/860,995
Intermittent patient suction system and control means therefor
Inventor:
Jay L. Lewis
Patented Case
View Patent ↗
Granted: Jul 22, 1980
Filed: Dec 15, 1977
Inventor
Jay L. Lewis
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.