Vacuum-suspended shoe
CA 2503652 A1 · Owner: Mackenzie, Maitland Craig · Inventors: Mackenzie, Maitland Craig; Caspers, Carl A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Footwear having a vacuum pump for removing fluid from its interior. The footwear can have a rigid outer shell, a flexible material bonded to the rigid outer shell, a thin sheath within the flexible material a heelstrike-actuated , vacuum pump in the heel and a vacuum hose connecting the vacuum pump to the interior. The pump can be configured to reduce or increase pressure within the footwear to provide different results.
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 November 3, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 3, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 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.