Granted Patent
Utility
US 4,248,728 · App. 06/016,310
Liquid scouring cleanser
Inventor:
Robert L. Puryear
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Feb 28, 1979
Inventor
Robert L. Puryear
Assignee (at issue)
Chemed 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.