Granted Patent
Utility
US 5,741,015 · App. 08/664,841
Pipe to manhole seal
Inventor:
William O. Skinner
Patented Case
View Patent ↗
Granted: Apr 21, 1998
Filed: Jun 17, 1996
Inventor
William O. Skinner
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.