IP Library › Granted Patent US 4,290,321
Granted Patent Utility
US 4,290,321 · App. 06/051,626

Variable lock differential

Inventor: Denney R. Wilson
Patented Case View Patent ↗
Granted: Sep 22, 1981 Filed: Jun 25, 1979
Inventor
Denney R. Wilson

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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,290,321
App. No.
06/051,626
Filed
1979-06-25
Granted
1981-09-22
Kind
A