Granted Patent
Utility
US 5,656,750 · App. 08/485,240
Processes for the preparation of squarylium dyes
Inventors:
Richard M. Allen, Peter K. Chu
Patented Case
View Patent ↗
Granted: Aug 12, 1997
Filed: Jun 6, 1995
Inventors
Richard M. Allen
Peter K. Chu
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.