Granted Patent
Utility
US 5,267,532 · App. 07/878,753
pH-indicating material and cat litter containing same
Inventors:
Lanny Franklin, Mary E. Sachs
Patented Case
View Patent ↗
Granted: Dec 7, 1993
Filed: May 5, 1992
Inventors
Lanny Franklin
Mary E. Sachs
Assignees (at issue)
Anitox Corporation
American Colloid 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.