Programmable logic controller
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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
Foreign Patent Documents
Other references
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 |
1035318 | January 1964 | GBX |
- 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
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)