Granted Patent
Utility
US 6,752,435 · App. 10/139,798
Symmetrical coupler apparatus for use with precast concrete segmental construction
Inventor:
Felix L. Sorkin
Patented Case
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Granted: Jun 22, 2004
Filed: May 7, 2002
Inventor
Felix L. Sorkin
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.