Methods for manufacturing coil springs
CA 2538985 C · Owner: Dreamwell, Ltd. · Inventors: Defranks, Michael S.; Banks, Larry; Dimarco, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The systems and methods include a feed mechanism supplying multi-strand wire (213) to a coil-spring winder (212). The coil-spring winder (212) receives wire (213) from a spool of wire (211) and forms that wire (213) into a coil spring (214). To feed the coil-spring winder (212) the systems include a wire , holder that supplies the wire (213) to the coil-spring winder (212) along a feed direction. The wire holder is supported for rotation about an axis (219) that may be aligned with the feed direction. Thus as the spool of wire (211) , revolves around the central spool axis (216) the spool (211) also revolves , around a second axis (219) which typically is orthogonal to the spool axis …
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 September 13, 2004 and granted August 20, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 13, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 13, 2026.
- 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.