Granted Patent
Utility
US 4,143,035 · App. 05/693,593
Disazo dyestuffs having an alkoxy group on the first and/or second component
Inventor:
Hans A. Stingl
Patented Case
View Patent ↗
Granted: Mar 6, 1979
Filed: Jun 7, 1976
Inventor
Hans A. Stingl
Assignee (at issue)
Toms River Chemical 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.