Cellulose derivative
CA 2618253 C · Owner: Kitazono, Eiichi · Inventors: Ito, Masaya; Kitazono, Eiichi; Sumi, Yoshihiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cellulose derivative which has a suitable elastic modulus and viscosity when it is dissolved in water and is useful as an adhesion barrier. The cellulose derivative has a molecular weight of 5 x 10 3 to 5 x 10 6 and is composed of a repeating unit represented by the following formula (I);, (see formula I) wherein R1, R2 and R3 are each independently selected from the group consisting of the following formulas (a) (b), (c) , and (d) in predetermined amount: -H (a), -CH2-COOH (b), -CH2-COOX (c), (see formula (d) (X in the formula (c) is an alkali metal and R4 and R5 in , the formula (d) are each independently an alkyl group or alkenyl group having 10 to 28 carbon atoms).
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 August 3, 2006 and granted May 28, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 3, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.