Granted Patent
Utility
US 4,820,192 · App. 07/204,811
Connecting block construction
Inventors:
W. John Denkmann, Leonard H. Drexler, Ronald H. Guelden, William T. Spitz
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Jun 10, 1988
Inventors
W. John Denkmann
Leonard H. Drexler
Ronald H. Guelden
William T. Spitz
Assignees (at issue)
American Telephone and Telegraph, Co.
AT&T Information Systems Inc.
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.