Granted Patent
Utility
US 4,496,708 · App. 06/561,472
Water-soluble polyurethane comb polymer production
Inventors:
David C. Dehm, Kenneth L. Hoy, Richard Charles Hoy
Patented Case
View Patent ↗
Granted: Jan 29, 1985
Filed: Dec 14, 1983
Inventors
David C. Dehm
Kenneth L. Hoy
Richard Charles Hoy
Assignee (at issue)
Union Carbide 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.