Data transmission system
CA 1252537 A · Owner: Emi Limited · Inventors: Smelt, Newark G.; Trask, Jeremy R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
14 :, ABSTRACT OF THE DISCLOSURE, The domestic communication network has a main control unit which can selectively address sixteen separate stations by sending signals along the common electrical mains wiring. Each station has a unique four-bit address identity while each signal sent out, by control unit has an address signal (formed of a four-bit address word and a mask code) and a data signal. The mask code informs the stations of how many bits in the address word are to be ignored. Each station has a unit to extract from the address signal, the mask code and input it to subtractors for modification of the, station identity and the received signal to the same number of most-significant …
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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
- Granted April 11, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 11, 2006.
- 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.