Granted Patent
Utility
US 5,771,507 · App. 08/841,048
Extendible drain closure device
Inventors:
Patrick E. Healy, Brian Schmidt
Patented Case
View Patent ↗
Granted: Jun 30, 1998
Filed: Apr 29, 1997
Inventors
Patrick E. Healy
Brian Schmidt
Assignee (at issue)
New Pig 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.