Granted Patent
Utility
US 4,876,003 · App. 07/191,640
Encased pool chemical tablet with domed ends
Inventor:
John M. Casberg
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: May 9, 1988
Inventor
John M. Casberg
Assignee (at issue)
Olin 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.