Granted Patent
Utility
US 4,190,489 · App. 05/944,631
Gold etchant composition and method
Inventors:
Surinder K. Bahl, Gale L. Leach
Patented Case
View Patent ↗
Granted: Feb 26, 1980
Filed: Sep 21, 1978
Inventors
Surinder K. Bahl
Gale L. Leach
Assignee (at issue)
The Mead Corporation
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.