Copolymerized methine colorant-polyester color concentrates
CA 2048992 C · Owner: Krutak, James John Sr. · Inventors: Krutak, James John Sr.; Weaver, Max Allen; Parham, William Whitfield
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are polyester color concentrates especially amorphous and partially-crystalline polyester color concentrates, comprising a polyester having copolymerized therein colored residues of at least one polyester-reactive thermally-stable methine, colorant compound. The color concentrates may be used to impart yellow shades and colors to various polymeric materials shaped articles fabricated of and coating formulated from such polymeric materials and especially, personal, medical and home care products where non-extractability of the colorant material is esential. Also disclosed are colored semicrystalline powders derived from the color concentrates.
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 January 3, 1991 and granted January 28, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 3, 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.