Granted Patent
Utility
US 4,636,155 · App. 06/626,297
Hydraulic seal having U-shaped gasket and a plurality of plastically deformable posts
Inventor:
David Francis
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: Jun 29, 1984
Inventor
David Francis
Assignee (at issue)
Commercial Shearing, 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.