IP Library › Granted Patent US 4,895,597
Granted Patent Utility
US 4,895,597 · App. 07/300,525

Recovery of precious metals

Inventors: Wilson L. Lin, Phillip L. Mattison, Michael J. Virnig
Patented Case View Patent ↗
Granted: Jan 23, 1990 Filed: Jan 23, 1989
Inventors
Wilson L. Lin
Phillip L. Mattison
Michael J. Virnig
Assignee (at issue)
Henkel Limited

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 4,895,597
App. No.
07/300,525
Filed
1989-01-23
Granted
1990-01-23
Kind
A