Apparatus for receiving and modifying a serial data packet from a communications network to indicate its status
CA 2126105 C · Owner: Dowdy, Gary Lynn · Inventors: Dowdy, Gary Lynn; Buda, Paul Robert; Peele, Kelvin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A series of remote input/output repeater modules (12a-12d) connected on a synchronous serial communication network supervised by a programmable logic controller(10) uses a synchronous serial communications protocol. The programmable logic controller (10) contains a transmitter module (16) for generating a data packet containing the state of output devices (24a-24d) connected to the remote input/output repeater modules (12a-12d). A receiver module (18) receives and decodes a returned modified data packet that indicates the state of input devices (22a-22d) connected to the same or other remote input/output repeater modules (12a-12d). The remote input/output repeater modules,(12a-12d) …
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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 17, 1992 and granted November 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2014.
- 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.