Granted Patent
Utility
US 4,484,547 · App. 06/575,483
Valve guide and method for making same
Inventor:
James W. Nickerson
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Jan 31, 1984
Inventor
James W. Nickerson
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.