Device for locking and unlocking sashes in door- or window frames
CA 2094666 C · Owner: Wilhelm Weidtmann Gmbh & Co. Kg · Inventors: Dreifert, Karl-Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device which can lock a sash to and unlock a sash from a door or window frame has a composite housing which is partially recessed into the frame and receives a portion of a reciprocable plate member which is coupled to one or more motion receiving elements serving to actually lock or unlock the sash. The housing further carries a handle which is pivotable in the plane of the plate member about an axis extending at right angles to such plane preferably through, an angle of approximately 180°. The plate member has one or more sliders which are reciprocable in one or more elongated grooves provided in one or more internal surfaces of the housing. The motion transmitting connection between …
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 April 22, 1993 and granted November 18, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 22, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2015.
- 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.