Granted Patent
Utility
US 4,976,457 · App. 07/281,101
Sleeve adapter
Inventor:
William Carter
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: Dec 7, 1988
Inventor
William Carter
Assignee (at issue)
Water Works Supply 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.