Granted Patent
Utility
US 4,490,270 · App. 06/402,587
Sanitizing liquid shampoo for carpets
Inventors:
Walter J. Hackett, Kyle K. Ito
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Jul 28, 1982
Inventors
Walter J. Hackett
Kyle K. Ito
Assignee (at issue)
PUREX CO., LTD.
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.