IP Library › Granted Patent US 4,979,783
Granted Patent Utility
US 4,979,783 · App. 07/378,740

Parking brake control valve dual actuating device

Inventor: Duane R. Johnson
Patented Case View Patent ↗
Granted: Dec 25, 1990 Filed: Jul 12, 1989
Inventor
Duane R. Johnson
Assignee (at issue)
AlliedSignal, 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.

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 4,979,783
App. No.
07/378,740
Filed
1989-07-12
Granted
1990-12-25
Kind
A