Granted Patent
Utility
US 4,339,240 · App. 06/147,437
Color changing polyacetylenic compounds
Inventor:
Gordhanbhai N. Patel
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: May 7, 1980
Inventor
Gordhanbhai N. Patel
Assignee (at issue)
ALLIED CONSULTING, INC.
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.