Granted Patent
Utility
US 4,459,089 · App. 06/456,195
Diaphragm pump with improved pressure regulation and damping
Inventors:
Kent D. Vincent, Hans-Georg Haertl
Patented Case
View Patent ↗
Granted: Jul 10, 1984
Filed: Jan 7, 1983
Inventors
Kent D. Vincent
Hans-Georg Haertl
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.