Granted Patent
Utility
US 4,263,198 · App. 06/044,725
Thickening agents for unsaturated polyester resin compositions
Inventors:
Martin L. Feldman, James T. De Groff
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: Jun 1, 1979
Inventors
Martin L. Feldman
James T. De Groff
Assignee (at issue)
Tenneco Chemicals, Inc.
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.