Granted Patent
Utility
US 4,218,220 · App. 05/965,937
Method of fading blue jeans
Inventors:
Frank R. Kappler, John J. Cramer, Sarwan K. Kakar
Patented Case
View Patent ↗
Granted: Aug 19, 1980
Filed: Dec 4, 1978
Inventors
Frank R. Kappler
John J. Cramer
Sarwan K. Kakar
Assignee (at issue)
BASF Wyandotte Corporation
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.