Granted Patent
Utility
US 5,404,972 · App. 08/291,735
Self-blocking gas spring with temperature-responsive bypass valve
Inventors:
Mark A. Popjoy, Paul K. McDonnell
Patented Case
View Patent ↗
Granted: Apr 11, 1995
Filed: Aug 17, 1994
Inventors
Mark A. Popjoy
Paul K. McDonnell
Assignee (at issue)
Fichtel & Sachs Industries, 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.