Nickel-free white gold alloys
CA 2123438 A1 · Owner: Reti, Aldo M. · Inventors: Reti, Aldo M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A white gold alloy composition consisting essentially of about 35 to 50 weight percent of gold about 35 to 63 weight percent of silver about 0.1 to 7, weight percent of a whitening component of zinc germanium or both, and palladium in an amount of about 9 weight percent or less. The whitening component and the palladium are present in an amount sufficient to impart a white gold appearance and a liquidus temperature of no greater than about 1950°F to the alloy preferably, between about 1700 and 1900°F and more preferably less, than about 1850°F. Thus the preferred amount palladium, is about 2 to 5 weight percent and the preferred amount of the whitening component is about 0.5 to 6 weight …
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 May 12, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 12, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 12, 2016.
- 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.