Granted Patent
Utility
US 4,477,290 · App. 06/456,642
Cleaning and etching process for aluminum containers
Inventors:
James W. Carroll, James Comstock
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Jan 10, 1983
Inventors
James W. Carroll
James Comstock
Assignee (at issue)
Pennwalt 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.