Jewelry rope chain
CA 1247874 A · Owner: Oroamerica, Inc. · Inventors: Proia, Gianfranco A.; Benhamou, Guy S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosure sets forth a different annular link as the building element; instead of using a split annular link of a 3:1 ratio of link inner diameter to major wire diameter, the link has substantially thinner annulus for forming the rope chain, an annulus that requires an over 5:1 ratio of inner annulus diameter to major wire diameter. The presently preferred ratio is between 5.2 and 5.7:1. It is possible to use even thinner annuluses i.e. having greater, ratios, e.g. 7.2-7.7:1 with even greater weight savings (approximately 35%), or other even greater odd-numbered ratios of inner annulus diameter to major wire diameter (e.g. 9.4-9.9:1). Thus, while there is no theoretical limit, there is …
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 January 3, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 3, 2006.
- 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.