Multi-subscriber alarm system with central receiving and transmitting installation
CA 1057833 A · Owner: Hillberg, Arne V. · Inventors: Hillberg, Arne V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An alarm system for a number of individual subscribers connected to a central installation in which each subscriber can signal the central installation when help is needed and the central installation can signal back to the subscriber indicating receipt of the call. The subscriber can make further calls and receiver signals from the central installation in return.
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 July 3, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 3, 1996.
- 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.