Granted Patent
Utility
US 5,195,995 · App. 07/349,155
Control vacuum to measure gas flow
Inventor:
Clarence L. Walker
Patented Case
View Patent ↗
Granted: Mar 23, 1993
Filed: May 9, 1989
Inventor
Clarence L. Walker
Assignee (at issue)
Sherwood Medical Company
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.