IP Library › Granted Patent US 4,200,495
Granted Patent Utility
US 4,200,495 · App. 05/943,460

Prevention of defluidization in the treatment of caking carbonaceous solids

Inventors: Barry Liss, Charles R. Welter
Patented Case View Patent ↗
Granted: Apr 29, 1980 Filed: Sep 18, 1978
Inventors
Barry Liss
Charles R. Welter

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 4,200,495
App. No.
05/943,460
Filed
1978-09-18
Granted
1980-04-29
Kind
A