IP Library › Granted Patent US 4,280,561
Granted Patent Utility
US 4,280,561 · App. 06/053,782

Valve

Inventor: John V. Fredd
Patented Case View Patent ↗
Granted: Jul 28, 1981 Filed: Jul 2, 1979
Inventor
John V. Fredd
Assignee (at issue)
Otis Engineering Corporation

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 4,280,561
App. No.
06/053,782
Filed
1979-07-02
Granted
1981-07-28
Kind
A