Soluble melanin
CA 2092205 A1 · Owner: Yale University · Inventors: Pawelek, John M.; Orlow, Seth J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A melanin that is soluble in an aqueous solution at a pH of at lest 5 to 9 at a temperature of 0 to 100 ·C. The melanin is further characterized by being capable of being filtered through at least a 0.45 micron size filter. Still further the melanin is, characterized by having a molecular weight of greater than 10,000 kilodaltons. The melanin is useful for providing a naturally-appearing tan to mammalian skin and hair. Such melanin can be produced by combining dopachrome and 5,6-dihydroxyindole (or allowing dopachrome to spontaneously form 5,6-dihydroxyindole) and an appropriate enzyme or by combining 5,6-dihydroxyindole and 5,6-dihydroxyindole-2-carboxylic acid or by incubating …
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 16, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 16, 2013.
- 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.