Granted Patent
Utility
US 5,249,555 · App. 07/869,418
Valve guide insert
Inventors:
James A. Kammeraad, Dwain L. Kamphuis, Robert T. Ritt
Patented Case
View Patent ↗
Granted: Oct 5, 1993
Filed: Apr 14, 1992
Inventors
James A. Kammeraad
Dwain L. Kamphuis
Robert T. Ritt
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.