Granted Patent
Utility
US 6,834,890 · App. 10/640,761
Coupler apparatus for use with a tendon-receiving duct in a segmental precast concrete structure
Inventor:
Felix L. Sorkin
Patented Case
View Patent ↗
Granted: Dec 28, 2004
Filed: Aug 15, 2003
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.