IP Library › Granted Patent US 4,973,771
Granted Patent Utility
US 4,973,771 · App. 07/146,260

Phase transfer catalysts

Inventor: Gary L. Cantrell
Patented Case View Patent ↗
Granted: Nov 27, 1990 Filed: Feb 9, 1987
Inventor
Gary L. Cantrell
Assignee (at issue)
MALLINCKRODT LLC

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 4,973,771
App. No.
07/146,260
Filed
1987-02-09
Granted
1990-11-27
Kind
A