Granted Patent
Utility
US 4,356,136 · App. 06/182,351
Method of densifying an article formed of reaction bonded silicon nitride
Inventor:
John A. Mangels
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: Aug 29, 1980
Inventor
John A. Mangels
Assignee (at issue)
Ford Motor Company
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.