Granted Patent
Utility
US 4,547,451 · App. 06/703,871
Hydrolyzable diffusion control layers in photographic products
Inventors:
Stanley J. Jasne, William C. Schwarzel, Charles I. Sullivan, Lloyd D. Taylor
Patented Case
View Patent ↗
Granted: Oct 15, 1985
Filed: Feb 21, 1985
Inventors
Stanley J. Jasne
William C. Schwarzel
Charles I. Sullivan
Lloyd D. Taylor
Assignee (at issue)
Polaroid Corporation, Patent Dept.
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.