Granted Patent
Utility
US 5,316,253 · App. 07/984,855
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Inventors:
Robert J. Flathau, Frank T. Connors
Patented Case
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Granted: May 31, 1994
Filed: Dec 3, 1992
Inventors
Robert J. Flathau
Frank T. Connors
Assignee (at issue)
Symons Corporation
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.