Self-inflatable air cushion
CA 2294017 A1 · Owner: Huang, Ing Chung · Inventors: Huang, Ing Chung
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A self-inflatable air cushion (1a) which includes a support chamber (1) mounted in a sole (6) of a shoe and holding a liquid a collapsible plenum , chamber (10) surrounded by the support chamber (1) and partially protruding over the top of the sole (6) and having a top air hole (31) passage means , (22, 33) connected between the support chamber (1) and the plenum chamber (10), and one-way valve (101) mounted in the passage means (22 33) to let , flow move in one direction from the plenum chamber (10) to the support chamber (1) upon compression of the plenum chamber (10).
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 September 25, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2019.
- 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.