Granted Patent
Utility
US 4,438,310 · App. 06/501,755
Method and apparatus for inductively heating valve seat inserts
Inventor:
John F. Cachat
Patented Case
View Patent ↗
Granted: Mar 20, 1984
Filed: Jun 13, 1983
Inventor
John F. Cachat
Assignee (at issue)
Park-Ohio Industries
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.