Granted Patent
Utility
US 4,989,790 · App. 07/456,634
Nozzle cap, spring valve and body assembly
Inventors:
Douglas S. Martin, Wilhelmus Johannes Joseph Maas
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Dec 26, 1989
Inventors
Douglas S. Martin
Wilhelmus Johannes Joseph Maas
Assignee (at issue)
AFA Products, 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.