Granted Patent
Utility
US 4,422,894 · App. 06/321,230
Gasket manufacture
Inventors:
Alan W. Atkinson, Janet M. Lancaster
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Nov 13, 1981
Inventors
Alan W. Atkinson
Janet M. Lancaster
Assignee (at issue)
T&N Materials Research Limited
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.