Granted Patent
Utility
US 6,203,234 · App. 09/344,855
Automatic piston lock mechanism
Inventor:
David S. Olson
Patented Case
View Patent ↗
Granted: Mar 20, 2001
Filed: Jun 28, 1999
Inventor
David S. Olson
Assignee (at issue)
United Fixtures Company
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.