Service request communication system
CA 2248440 A1 · Owner: Hoptroff, Richard · Inventors: Hoptroff, Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A service request communication system for use in a restaurant or the like includes, a plurality of transmitter units for sending requests and a plurality of , portable receiver units carried by service providers. The transmitter units include a keypad whereby a variety of, service requests can be selected by a customer. On operating the keypad a , transmitter in the, transmitter unit is activated generating wireless signals which identify the transmitter unit and, the type of service requested. The signals are received by the receiver units. In addition to a, receiver, a typical receiver unit includes at least a microcontroller and a display. On, regenerating the transmitter unit …
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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 September 25, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 25, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2020.
- 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.