Granted Patent
Utility
US 4,350,346 · App. 06/248,507
Heat resistant seal
Inventor:
John H. Fowler
Patented Case
View Patent ↗
Granted: Sep 21, 1982
Filed: Mar 27, 1981
Inventor
John H. Fowler
Assignee (at issue)
SMITH INTERNATIONAL, 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.