Backrest
CA 1308642 C · Owner: Duoback Korea Co. Ltd. · Inventors: Brunig, Matthias; Stolle, Herbert D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A backrest for stools, seats chairs, and the like, characterized by two backrest shells (1) that are arranged at the sides and are configured in the manner of the contact surfaces of equestrian saddles, these being configured so as to be concave with reference an axis that is essentially perpendicular to the seating surface (20), and so as to be convex with reference to a horizontal axis above the seating surface (20). (Figure 1).
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
- Granted October 13, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 13, 2009.
- 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.