Granted Patent
Utility
US 4,307,753 · App. 06/173,281
Wide frequency pulsation dampener device
Inventor:
Eldon O. Dryer
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Jul 29, 1980
Inventor
Eldon O. Dryer
Assignee (at issue)
Greer Hydraulics, Incorporated
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.