Granted Patent
Utility
US 6,283,885 · App. 09/480,890
Pressure relief check valve arrangement for differential assembly
Inventor:
Earl James Irwin
Patented Case
View Patent ↗
Granted: Sep 4, 2001
Filed: Jan 11, 2000
Inventor
Earl James Irwin
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.