Bleaching and detergent compositions
CA 2000538 C · Owner: Clements, Anthony Henry · Inventors: Clements, Anthony Henry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Storage-stable washing and/or bleaching compositions containing a peroxyacid and/or a peroxyacid-yielding compound as bleaching agent are disclosed which contain as optical brightener a benzofuranyl biphenyl compound of the formula:, wherein R is hydrogen C1-C4 alkyl, C1-C4 alkoxy, halogen, phenoxy or benzyloxy as mono or multiple substituent; M is hydrogen and/or an equivalent of a non-chromophoric cation; n is an integer from 0-2 and m, is 0 or 1, with the proviso that n and m are not both zero .
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 October 12, 1989 and granted December 13, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 12, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 2011.
- 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.