Unitary spring for biasing a chair seat back support mechanism against a seat tilt mechanism
CA 2089694 A1 · Owner: Doerner Products Limited · Inventors: Stumpf, William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved mechanism for biasing a seat back with respect to a seat tilt mechanism is disclosed. The improved mechanism includes a unitary spring having two coil springs interconnected by a loop. Each coil has an arm extending therefrom and the two arms are parallel. The arms and loop are integrally formed with the coils to form the unitary spring. The seat tilt mechanism is attachable to the underside of a chair seat and a seat back support bracket is pivotally attached to the seat tilt mechanism at the back of the chair seat. A seat back support arm is attached at one end to the seat back and the other end is attached to the seat back support mechanism. The unitary spring is disposed …
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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 February 17, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2015.
- 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.