Chelator compositions comprising alpha- diamine compounds
CA 2079486 C · Owner: The Procter & Gamble Company · Inventors: Bush, Rodney Dean; Bissett, Donald Lynn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention involves photoprotective compositions which are useful for topical application to prevent damage to skin caused by acute or chronic exposure to ultraviolet light comprising chelating agents having formula (I) wherein each -R1 is independently selected from the group consisting of alkyl aryl and , heteroaryl, or the -R1's are covalently bonded together to form a cyclic alkyl; -R2 and -R3 are -OR4; in which case there is no bond or a polar bond between -R2 and the nitrogen covalently bonded to -R3, each -R4 being independently selected from the group consisting of hydrogen, alkyl, aryl and heteroaryl except that both -R4 are not methyl when both -R1 are furyl; or -R2 …
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 April 9, 1991 and granted November 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 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.