Granted Patent
Utility
US 6,296,021 · App. 09/619,844
Leak repair device for rigid pipes
Inventor:
Wing G. Lew
Patented Case
View Patent ↗
Granted: Oct 2, 2001
Filed: Jul 20, 2000
Inventor
Wing G. Lew
Assignee (at issue)
Sachwin Products, 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.