Granted Patent
Utility
US 4,479,589 · App. 06/385,803
Plunger lock for manual dispensing pump
Inventor:
John M. B. Ford
Patented Case
View Patent ↗
Granted: Oct 30, 1984
Filed: Jun 7, 1982
Inventor
John M. B. Ford
Assignee (at issue)
Realex Corporation
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.