Granted Patent
Utility
US 4,400,069 · App. 06/264,620
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Inventors:
Alfred J. St. Pierre, Dann Darnstaedt, Laurence Blake
Patented Case
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Granted: Aug 23, 1983
Filed: May 15, 1981
Inventors
Alfred J. St. Pierre
Dann Darnstaedt
Laurence Blake
Assignee (at issue)
Compugraphic 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.