Granted Patent
Utility
US 5,435,249 · App. 08/139,942
Shock tube initiator with phthalocyanine color indicator
Inventors:
Geoffrey Frederick Brent, Malcolm D. Harding
Patented Case
View Patent ↗
Granted: Jul 25, 1995
Filed: Oct 20, 1993
Inventors
Geoffrey Frederick Brent
Malcolm D. Harding
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.