Granted Patent
Utility
US 4,255,375 · App. 06/043,592
Process for the preparation of dustless, readily-dispersible pigment or dyestuff granules
Inventors:
Ian Alexander Macpherson, John A. Stirling, Ian Robert Wheeler, James McGeachie McCrae
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: May 29, 1979
Inventors
Ian Alexander Macpherson
John A. Stirling
Ian Robert Wheeler
James McGeachie McCrae
Assignee (at issue)
Ciba-Geigy
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.