Programmable logic controller
Backes July 31, 1
U.S. patent number D309,600 [Application Number 07/181,277] was granted by the patent office on 1990-07-31 for programmable logic controller. This patent grant is currently assigned to Square D Company. Invention is credited to James J. Backes.
| United States Patent | D309,600 |
| Backes | July 31, 1990 |
Programmable logic controller
Claims
The ornamental design for a programmable logic controller, as shown.
| Inventors: | Backes; James J. (Hales Corners, WI) |
|---|---|
| Assignee: | Square D Company (Palatine,
IL) |
| Appl. No.: | 07/181,277 |
| Filed: | April 8, 1988 |
| Current U.S. Class: | D13/162.1 |
| Field of Search: | ;D13/12,35,40,41,99,123,162,158,184,199 ;D14/100,101,114 ;361/331-334,346,390-394 ;364/141,146,147,188,190-193 ;901/3,4,5 |
References Cited [Referenced By]
U.S. Patent Documents
| D272819 | February 1984 | Bean et al. |
| D274615 | July 1984 | Bean et al. |
| D281493 | November 1985 | Prager |
| D292394 | October 1987 | Boucher |
| D296432 | June 1988 | Harris et al. |
| 4672511 | June 1987 | Meusel et al. |
| 4716497 | December 1987 | Craker |
| 1035318 | Jan 1964 | GB | |||
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.. |
Primary Examiner: Lucas; Susan J.
Assistant Examiner: Sincavage; Joel
Attorney, Agent or Firm: Femal; Michael J.
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.
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