Granted Patent
Utility
US 4,902,612 · App. 07/310,593
Photographic coating solutions
Inventors:
John Cawse, David Rowland
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Feb 13, 1989
Inventors
John Cawse
David Rowland
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.