Granted Patent
Utility
US 4,961,872 · App. 07/336,556
Calcium hypochlorite tablets
Inventor:
Richard G. Sinclair
Patented Case
View Patent ↗
Granted: Oct 9, 1990
Filed: Apr 7, 1989
Inventor
Richard G. Sinclair
Assignee (at issue)
The Drackett 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.