Security systems for controlling passage between restricted and unrestricted area
CA 1294027 C · Owner: Dicaire, Luc · Inventors: Dicaire, Luc; Leroux, John E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a new and useful security system for confining a person or object within a designated area and comprising an electrically operated door restraining device to be installed on at least one door; an electronic detection device to be installed on at least the designated area side of the door and adjacent the door which activates the door restraining device responsive to detected signals to restrain the door in the closed position; and a remote generating device associated with the person or object for continuously generating the signals.
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 January 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 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.