Granted Patent
Utility
US 4,996,141 · App. 07/295,795
Monomethine compounds
Inventors:
Geoffrey E. Ficken, Douglas J. Edwards, Clive W. Mowforth, Trevor J. Maternaghan, Rolf Steiger, Victor W. Dolden
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Jan 11, 1989
Inventors
Geoffrey E. Ficken
Douglas J. Edwards
Clive W. Mowforth
Trevor J. Maternaghan
Rolf Steiger
Victor W. Dolden
Assignee (at issue)
Ilford AG
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.