Granted Patent
Utility
US 4,818,436 · App. 07/091,684
Process and composition for providing reduced discoloration of pyrithiones
Inventors:
Cheryl B. French, Gene A. Hyde
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Aug 31, 1987
Inventors
Cheryl B. French
Gene A. Hyde
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.