Silicone type cinnamic acid derivative, preparation method thereof, uv-ray absorber, and external skin treatment agent
CA 1332240 C · Owner: Yoshida, Masashi · Inventors: Uehara, Keiichi; Nanba, Tomiyuki; Yoshida, Masashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A silicone type cinnamic acid derivative which is a siloxane having at least one unit represented by the formula (I):, (I), and having the other units which may exist in the siloxane being represented by the formula: O(4-m)/2SiR3m, wherein R1 represents an alkyl group having 1 to 4 carbon atoms, a phenyl group, or a trimethylsiloxy group, R2 is a divalent hydrocarbon group having at least two carbon atoms, which may include a heteroatom O, X is an alkoxy group, n is an integer of 0 to 3, a is an integer of 2 or 3, R3 is an alkyl group having 1 to 4 carbon atoms, a phenyl group or a, trimethylsiloxy group, and m is an integer of 0 to 3. The novel derivatives of the invention are useful in …
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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
- Granted October 4, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 4, 2011.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.