Granted Patent
Utility
US 4,417,459 · App. 06/288,432
Autofrettage process
Inventor:
Nobuya Tomita
Patented Case
View Patent ↗
Granted: Nov 29, 1983
Filed: Jul 30, 1981
Inventor
Nobuya Tomita
Assignee (at issue)
National Distillers and Chemical Corporation
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.