Granted Patent
Utility
US 4,257,495 · App. 06/036,507
Damping device
Inventor:
Forbes G. de Brie Perry
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: May 7, 1979
Inventor
Forbes G. de Brie Perry
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.