Granted Patent
Utility
US 4,354,809 · App. 06/126,432
Fixed displacement vane pump with undervane pumping
Inventor:
Jack G. Sundberg
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: Mar 3, 1980
Inventor
Jack G. Sundberg
Assignee (at issue)
Chandler Evans Inc.
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.