Polyamino acid dispersants
CA 2106400 C · Owner: Sikes, C. Steven · Inventors: Sikes, C. Steven
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polyamino acids of the formulae (I); poly (X)n poly (Y)m and (II). In formula (I) each X independently is aspartic acid glutamic acid, phosphoserine, phosphohomoserine phosphotyrosine, or phosphothreonine, each Y independently is alanine,leucine, isoleucine, valine, glycine or other non polar. amino acid residues n is 2 to 60, m is 2 to 60, and n + m is > 5 and wherein poly (X)n may contain up to 10% of the Y residues and poly (Y)m may contain up to 10% of the X residues and, salts thereof;and in formula (II): poly (X')a poly (Y')b each X' independently is aspartate glutamate, glutamine, asparagine, or anionic derivatives of these amino acids or phosphoserine, each Y' independently is a …
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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 October 22, 1991 and granted April 21, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 22, 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.