Linear lift drive device
CA 2436731 C · Owner: Shaw, Peter · Inventors: Shaw, Peter; Molnar, Gordon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lift drive comprising: a spiral drive element having an axis of rotation a rack having teeth sized and shaped to be engaged by the spiral drive element the rack having a longitudinal axis parallel to the axis of rotation and a motor to rotate the spiral drive element wherein upon the spiral drive element rotating one of the spiral drive element and the rack moves relative to the other along the longitudinal axis.
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 6, 2003 and granted April 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 6, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 2025.
- 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.