Granted Patent
Utility
US 4,840,281 · App. 07/147,891
Tamper evident optical device and article utilizing the same
Inventors:
Roger W. Phillips, Vernon C. Spellman, Wayne L. Gossett, Marc A. Kamerling, Paul G. Coombs
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Jan 25, 1988
Inventors
Roger W. Phillips
Vernon C. Spellman
Wayne L. Gossett
Marc A. Kamerling
Paul G. Coombs
Assignee (at issue)
Optical Coating Laboratory, 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.