IP Library › Granted Patent US 4,312,526
Granted Patent Utility
US 4,312,526 · App. 06/161,996

Pipe coupling with open sleeve

Inventor: Thomas R. Cassel
Patented Case View Patent ↗
Granted: Jan 26, 1982 Filed: Jun 23, 1980
Inventor
Thomas R. Cassel

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 4,312,526
App. No.
06/161,996
Filed
1980-06-23
Granted
1982-01-26
Kind
A