Method and apparatus for forming strings of pocketed springs
CA 2223799 C · Owner: St. Clair, Albert Ronald · Inventors: St. Clair, Albert Ronald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus for forming a string (136) of springs (16) enclosed within individual pockets of a fabric sleeve (33) having flat overlapping , side flaps (A, B). The flaps form a longitudinally extending side seam (138) in the string, thus preventing the common problem of false loft in conventional mattress constructions.
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 June 6, 1996 and granted October 30, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 6, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2018.
- 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.