Granted Patent
Utility
US 4,649,870 · App. 06/855,177
Method and apparatus for improving lubricant seal life
Inventor:
James Hoelzer
Patented Case
View Patent ↗
Granted: Mar 17, 1987
Filed: Apr 24, 1986
Inventor
James Hoelzer
Assignee (at issue)
J. I. Case Company
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.