Stair climbing aid
CA 2129377 A1 · Owner: Wallum, Ronald I. · Inventors: Wallum, Ronald I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stairway climbing aid having a plurality of individual adjustable half-step members fixedly connected to a rigid elongated channel member at spaced locations along the length of the latter to comprise a rigid assembly. The channel member is connected to each of the half-step members adjacent the rear end of the latter and at an elevation and angle such that the channel member will extend upon or adjacent the outer edge of the tread of each step. The half-step members are longitudinally adjustable so that their length can equal the depth of the particular steps to which they are applied. Thus any, stairway can be readily modified to facilitate travel thereover by persons having difficulty …
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 3, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 3, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 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.