Granted Patent
Utility
US 4,428,989 · App. 06/390,663
Anti-fouling and anti-sliming gel coat
Inventor:
David W. Marshall
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Jun 21, 1982
Inventor
David W. Marshall
Assignee (at issue)
Kennecott Holdings 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.