Granted Patent
Utility
US 5,137,964 · App. 07/670,623
Visually imageable polyacetylene salt dyes
Inventors:
David F. Lewis, John C. Hornby
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Mar 18, 1991
Inventors
David F. Lewis
John C. Hornby
Assignee (at issue)
ISP INVESTMENTS LLC
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.