Granted Patent
Utility
US 4,730,021 · App. 07/004,230
Process for preparing aqueous dispersions of acrylic-urethane graft copolymers
Inventors:
Walter M. W. Zom, Hendricus C. Goos, Johan Stijntjes
Patented Case
View Patent ↗
Granted: Mar 8, 1988
Filed: Jan 5, 1987
Inventors
Walter M. W. Zom
Hendricus C. Goos
Johan Stijntjes
Assignee (at issue)
Polyvinyl Chemie Holland B.V.
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.