Selective self-locking deadbolt latch
CA 2033003 C · Owner: Newfrey Llc · Inventors: Dietrich, Hagen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A selectively self-locking deadbolt latch for incorporation into doors or the like. The latch can be preliminarily "armed" such that as the door closes the bolt will extend into the opening of the door strike. The latch mechanism includes a cam lever having a shoulder which loads against the bolt extension. A compression spring within the bolt urges the bolt towards the locked position once the cam lever is released from the bolt extension by closing the door. The temporary retraction of the bolt as it engages the door strike releases the bolt and cam lever. A beam spring acting on the cam lever urges the cam lever forward towards the locked position. The bolt is initially armed by turning …
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 December 21, 1990 and granted May 7, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 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.