Granted Patent
Utility
US 4,732,397 · App. 06/858,341
Cast in place combination aperture closure member and pipe seal for fluid distribution box
Inventor:
Norman W. Gavin
Patented Case
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Granted: Mar 22, 1988
Filed: May 1, 1986
Inventor
Norman W. Gavin
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.