Granted Patent
Utility
US 4,592,940 · App. 06/768,302
Stain-resistant nylon carpets impregnated with condensation product of formaldehyde with mixture of diphenolsulfone and phenolsulfonic acid
Inventors:
Randolph C. Blyth, Pompelio A. Ucci
Patented Case
View Patent ↗
Granted: Jun 3, 1986
Filed: Aug 22, 1985
Inventors
Randolph C. Blyth
Pompelio A. Ucci
Assignee (at issue)
Monsanto Company
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.