Granted Patent
Utility
US 4,970,020 · App. 07/377,676
Calcium hypochlorite composition
Inventors:
Harlan B. Johnson, Charles R. Wiedrich, Ernie Allen, Peter P. Howell
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Jul 10, 1989
Inventors
Harlan B. Johnson
Charles R. Wiedrich
Ernie Allen
Peter P. Howell
Assignee (at issue)
PPG Industries, Inc.
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.