Granted Patent
Utility
US 5,455,148 · App. 08/389,796
Two-phase acidic aqueous compositions for diffusion transfer products
Inventors:
David W. Avison, Agota F. Fehervari, David A. Johnson, Diana R. Koretsky
Patented Case
View Patent ↗
Granted: Oct 3, 1995
Filed: Feb 16, 1995
Inventors
David W. Avison
Agota F. Fehervari
David A. Johnson
Diana R. Koretsky
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.