Dual ethernet stack for maximum speed access to a plc
CA 2362437 C · Owner: Square D Company · Inventors: Papadopolous, A. Dean; Naismith, Ronald H.; Tanzman, Allan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control system includes an Internet web interface to a network of at least one programmable logic control system running an application program for controlling output devices in response to status of input devices. The Web interface runs Web pages from an Ethernet board coupled directly to the PLC back plane and includes an HTTP protocol interpreter a PLC back plane driver, a TCP/IP stack and an Ethernet board kernel. The Web inteface provides access to the PLC back plane by a user at a remote location through the Internet. The interface translates the industry standard Ethernet TCP/IP and HTTP protocols , used on the Internet into data recognizable to the PLC. Using this interface …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 7, 2000 and granted May 27, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 7, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 2022.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.