Granted Patent
Utility
US 4,546,062 · App. 06/635,734
Polymeric pH-sensitive optical filter agents and articles including same
Inventors:
Irena Y. Bronstein-Bonte, Edward P. Lindholm
Patented Case
View Patent ↗
Granted: Oct 8, 1985
Filed: Jul 30, 1984
Inventors
Irena Y. Bronstein-Bonte
Edward P. Lindholm
Assignee (at issue)
Polaroid 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.