Granted Patent
Utility
US 4,737,449 · App. 06/822,071
Photochromic 3-pyrryl fulgides and fulgimides
Inventors:
Harry G. Heller, Stephen N. Oliver, Stuart Alistair Harris
Patented Case
View Patent ↗
Granted: Apr 12, 1988
Filed: Jan 24, 1986
Inventors
Harry G. Heller
Stephen N. Oliver
Stuart Alistair Harris
Assignee (at issue)
The Plessey Company PLC
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.