Granted Patent
Utility
US 4,740,448 · App. 06/846,586
Hybrid color films with dye developer and thiazolidine dye releaser
Inventor:
Peter O. Kliem
Patented Case
View Patent ↗
Granted: Apr 26, 1988
Filed: Mar 31, 1986
Inventor
Peter O. Kliem
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.