Granted Patent
Utility
US 4,255,152 · App. 05/939,583
Process for the dyeing of hydrophobic fibres
Inventors:
Brian Hewitt, Cyril Hobday, James Jack, John F. E. Keenan
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Sep 5, 1978
Inventors
Brian Hewitt
Cyril Hobday
James Jack
John F. E. Keenan
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.