Granted Patent
Utility
US 4,489,890 · App. 06/395,685
Hand-operated pump
Inventor:
Douglas S. Martin
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Jul 6, 1982
Inventor
Douglas S. Martin
Assignee (at issue)
Universal Dispensing Systems, 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.