Fine jewelry rope chain
CA 2011673 C · Owner: Rozenwasser, David · Inventors: Rozenwasser, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A jewelry rope chain having tightly interfitting links made of wire of a given cross-section, each link having a small gap formed therein slightly larger than the cross-section of said wire, so as to enable one of said links to pass through the gap of a second such link said links being intertwined to fit tightly one against the other and form in outward appearance a double helix the improvement comprising each link being of a non-circular elongated shape and including a major axis defining longer outer and inner diameters and a minor axis defining shorter outer and inner diameters said, gap lying in a link section parallel to the major axis said shorter inner diameter being just over X …
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 March 7, 1990 and granted March 23, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 2012.
- 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.