Granted Patent
Utility
US 4,768,479 · App. 07/018,702
Oil-sealing valve guide insert and method of manufacture
Inventor:
James A. Kammeraad
Patented Case
View Patent ↗
Granted: Sep 6, 1988
Filed: Feb 25, 1987
Inventor
James A. Kammeraad
Assignee (at issue)
K-LINE INDUSTRIES, 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.