Latch-operating mechanism for a panic egress device
CA 2023040 C · Owner: Von Duprin, Inc. · Inventors: Coleman, Michael D.; Stadtfeld, Kerry W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The mechanism is configured to operate both a primary latch bolt and secondary latches and, provides for immediate, ready egress for the side of a door to which the mechanism is mounted but offers, high security for the other outside of the door. The latch bolt is directly controlled by a first linkage, and the secondary latches are directly controlled by a second linkage. During egress both, linkages translate together, via a pin connection. However a lost motion arrangement prevents, retraction of either the bolt or the secondary, latches, if the other is compromised (or operated by a key or combination). From the outside high, security side of the door, the latch bolt and the secondary …
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
- Filed August 9, 1990 and granted October 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2012.
- 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.