Mattress construction
CA 2234839 C · Owner: Warner, Bradley · Inventors: Warner, Bradley
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mattress has a resilient internal construction formed by a border surrounding a larger interior region. The border comprises a plurality of rows of pocketed springs each of which consists of a metal coil contained within a pocket of soft material. In the border coils of adjacent pocketed springs are linked to one another such that each pocketed spring derives strength from an adjacent pocketed spring making the border more rigid than the interior region of the mattress.
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 April 15, 1998 and granted December 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 15, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 2020.
- 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.