Personal alarm apparatus
CA 1191642 A · Owner: Almicro Electronics Inc. · Inventors: Shkawrytko, Victor; Wagner, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A personal alarm apparatus comprises a write mouned R.F. transmitter including a push button trigger and a relay station connected to the telephone line. The relay station on receipt of the transmitted alarm signal dials the first of up to four stored telephone numbers and repeats a digitized vocal message. The relay station includes a telephone line interface having a touchtone sensor, a dial tone sensor, a ring tone sensor a line fault, sensor and a sensor for detecting an off hook extension phone on the line. The touchtone sensor can be used for sensing a touchtone on the like to cease the message and the ring tone sensor can be used for counting rings in a call-back before intercepting …
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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 August 6, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 6, 2002.
- 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.