Shoe with air valve for air refreshing system
CA 2352015 A1 · Owner: Chu, Huey-Cheng · Inventors: Chu, Huey-Cheng
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shoe with air valve for air refreshing system which includes an air inlet valve and an air, outlet valves. The sole has a lateral wall that defines an air chamber and air channels in an inner, portion of the sole and there is an isolating wall separating the air chamber and air channels. The lateral wall has a through hole or bore therethrough and the isolating wall has an angled, hrough hole or bore therethrough. The air valve has a mounting portion with a movable, diaphragm and the air valve can be inserted in the lateral wall bore of the air chamber in the sole, so as to provide a unidirectional air inlet valve. The unidirectional air valve can also be installed, in the bore in …
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 July 3, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 3, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 3, 2023.
- 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.