IP Library › Granted Patent US 4,319,922
Granted Patent Utility
US 4,319,922 · App. 06/106,993

Recovery of gold from an etching solution

Inventor: David MacDonald
Patented Case View Patent ↗
Granted: Mar 16, 1982 Filed: Dec 26, 1979
Inventor
David MacDonald
Assignee (at issue)
Western Electric Company, Inc.

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 4,319,922
App. No.
06/106,993
Filed
1979-12-26
Granted
1982-03-16
Kind
A