Granted Patent
Utility
US 4,665,309 · App. 06/658,232
Self heating gasket for hermetically sealing a lid to a box
Inventor:
Rodney L. Derbyshire
Patented Case
View Patent ↗
Granted: May 12, 1987
Filed: Oct 5, 1984
Inventor
Rodney L. Derbyshire
Assignee (at issue)
Metcal, 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.