Granted Patent
Utility
US 4,352,835 · App. 06/279,290
Masking portions of a substrate
Inventors:
Walter R. Holbrook, William A. Sponsler
Patented Case
View Patent ↗
Granted: Oct 5, 1982
Filed: Jul 1, 1981
Inventors
Walter R. Holbrook
William A. Sponsler
Assignees (at issue)
Western Electric Company, Inc.
Bell Telephone Laboratories, 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.