IP Library › Granted Patent US 5,188,749
Granted Patent Utility
US 5,188,749 · App. 07/729,974

R22/R124/R142b refrigerant blends

Inventor: Richard M. Crooker
Patented Case View Patent ↗
Granted: Feb 23, 1993 Filed: Jul 15, 1991
Inventor
Richard M. Crooker
Assignee (at issue)
Elf Atochem North America, 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 5,188,749
App. No.
07/729,974
Filed
1991-07-15
Granted
1993-02-23
Kind
A