Latch with adjustable backset
CA 2185769 C · Owner: Ellis, Philip C. · Inventors: Ellis, Philip C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The adjustable latch bolt of this invention features a novel cam actuating assembly which permits election of one of two door knob spindle backsets which are in standard usage. The cam assembly is comprised of two half hubs each having one arm so that, one half hub operates the drawbar in one direction of rotation and the other in the opposite direction of rotation. The half hubs are formed so that a portion of one half hub nests in a depression in the other in such a way that the two half hubs can rotate relative to each other. When the hubs are set to one of two backsets and are in a position to actuate the drawbar non-circular openings, passing through the axis of rotation of the two …
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 September 17, 1996 and granted February 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 2018.
- 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.