Programmable logic controller

- Square D Company
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Description

FIG. 1 is a top, left, front perspective view of a programmable logic controller showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a rear elevational view thereof.

Referenced Cited
U.S. Patent Documents
D272819 February 28, 1984 Bean et al.
D274615 July 10, 1984 Bean et al.
D281493 November 26, 1985 Prager
D292394 October 20, 1987 Boucher
D296432 June 28, 1988 Harris et al.
4672511 June 9, 1987 Meusel et al.
4716497 December 29, 1987 Craker
Foreign Patent Documents
1035318 January 1964 GBX
Other references
  • Square D Company, 1987 Brochure "Programmable and Cell Controller Product Overview". Design News, 12-2-85, Bradley Controller. New Equipment Digest, 1-85, Gould Controller.
Patent History
Patent number: D309600
Type: Grant
Filed: Apr 8, 1988
Date of Patent: Jul 31, 1990
Assignee: Square D Company (Palatine, IL)
Inventor: James J. Backes (Hales Corners, WI)
Primary Examiner: Susan J. Lucas
Assistant Examiner: Joel Sincavage
Attorney: Michael J. Femal
Application Number: 7/181,277
Classifications
Current U.S. Class: Control Panel, Console Or Module (D13/162)