IP Library › Granted Patent US 4,941,502
Granted Patent Utility
US 4,941,502 · App. 07/359,134

Low pressure recirculation valve

Inventors: George J. Loos, Horace J. Maxwell
Patented Case View Patent ↗
Granted: Jul 17, 1990 Filed: May 31, 1989
Inventors
George J. Loos
Horace J. Maxwell
Assignee (at issue)
Keystone International

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 4,941,502
App. No.
07/359,134
Filed
1989-05-31
Granted
1990-07-17
Kind
A