IP Library Granted Patent US 4,664,686
Granted Patent Utility
US 4,664,686 · App. 06/827,165

Process to separate nitrogen and methane

Inventors: Ravindra F. Pahade, James J. Maloney, James R. Handley
Patented Case View Patent ↗
Granted: May 12, 1987 Filed: Feb 7, 1986
Inventors
Ravindra F. Pahade
James J. Maloney
James R. Handley
Assignee (at issue)
Union Carbide 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 4,664,686
App. No.
06/827,165
Filed
1986-02-07
Granted
1987-05-12
Kind
A