Switch for grooved rails
CA 2068903 C · Owner: Allegrucci, Jean-Pierre · Inventors: Risch, Charles; Allegrucci, Jean-Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The switch is constituted by a profiled cradle forming the housing of a movable tongue-rail (18) for deviation and constituted by a profiled body (20) constructed by machining by removal of swarf. In order to reduce the machining waste and to improve the reliability of movement of the tongue-rail the body (20), is bolted between a stock-rail (22) and an opposite rail (24), both deprived of their adjacent foot over the entire length of the body (20) and the upper surface of the body (20) supporting the movable part of the tonguerail (18) is profiled so as to present flat pillow blocks (28) for support of the tongue-rail (18) alternating with recesses (30) machined in the body (20).
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 May 19, 1992 and granted December 2, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 19, 2014.
- 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.