Granted Patent
Utility
US 4,585,820 · App. 06/739,498
Mixtures of a polyacrylic acid and a copolymer of acrylic acid and acrylamide as thickeners in printing pastes for dyeing and printing fibre material
Inventors:
Raymond Defago, Wolfgang Sutterlin
Patented Case
View Patent ↗
Granted: Apr 29, 1986
Filed: May 30, 1985
Inventors
Raymond Defago
Wolfgang Sutterlin
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.