Granted Patent
Utility
US 4,615,966 · App. 06/821,074
Color transfer photographic processes and products with indole phthalein filter dyes
Inventors:
Alan L. Borror, Efthimios Chinoporos, Cheryl P. Petersen
Patented Case
View Patent ↗
Granted: Oct 7, 1986
Filed: Jan 21, 1986
Inventors
Alan L. Borror
Efthimios Chinoporos
Cheryl P. Petersen
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.