Overhead door opener
CA 2124222 C · Owner: Wandio, Raymond · Inventors: Wandio, Raymond
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reversing mechanism for an overhead door opener is described. The reversing mechanism includes a channel-form trolley track. A centrally positioned longitudinal slot extends for the length of a bottom of the trolley track. Side openings are provided at a first end and the second end of the trolley track. A trolley plate is positioned in the trolley track with a control arm edge extending through the slot. A chain/cable return guide having an axial chain/cable receiving passage is secured to one of the opposed faces of the trolley plate. Channel engaging guide blocks project from opposed faces of the trolley plate to engage a top and the bottom of the trolley track thereby preventing the …
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 20, 1994 and granted October 13, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 20, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 2016.
- 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.