Semiconductor integrated circuit for telephone
CA 1298677 C · Owner: Hishiki, Yuji · Inventors: Hishiki, Yuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An integrated semiconductor dialing circuit for push button telephone systems which is capable of entering an access wait-state pause and thereby providing semiautomatic access a wide variety of telephone dial-up services. The integrated circuit includes a keyboard intrface circuit a memory circuit, a control circuit, a wait pause detection circuit a signal outuput circuit, and a status output circuit interconnected by a plurality of signal lines.
Read the whole patent
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 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 7, 2009.
- 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.