Granted Patent
Utility
US 5,262,549 · App. 08/039,696
Benzpyrylium dyes, and processes for their preparation and use
Inventors:
Stephen J. Telfer, Socorro M. Ramos, Michael J. Zuraw
Patented Case
View Patent ↗
Granted: Nov 16, 1993
Filed: Mar 29, 1993
Inventors
Stephen J. Telfer
Socorro M. Ramos
Michael J. Zuraw
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.