Granted Patent
Utility
US 5,227,498 · App. 07/795,034
Squarylium dyes, and processes and intermediates for the preparation thereof
Inventors:
John Lee, Donald A. McGowan, Mark R. Mischke, Socorro M. Ramos, Stephen J. Telfer
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Nov 20, 1991
Inventors
John Lee
Donald A. McGowan
Mark R. Mischke
Socorro M. Ramos
Stephen J. Telfer
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.