IP Library › Granted Patent US 4,429,053
Granted Patent Utility
US 4,429,053 · App. 06/327,611

Rare earth-containing Y zeolite compositions

Inventor: John W. Ward
Patented Case View Patent ↗
Granted: Jan 31, 1984 Filed: Dec 4, 1981
Inventor
John W. Ward
Assignee (at issue)
Union Oil Company of California

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 4,429,053
App. No.
06/327,611
Filed
1981-12-04
Granted
1984-01-31
Kind
A