Method for classifying leukocytes and a reagent used therefor
CA 2027452 C · Owner: Hamaguchi, Yukio · Inventors: Ohmi, Hitomi; Hamaguchi, Yukio; Tsujino, Yukio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reagent for enabling leukocytes to be classified and measured by lyzing erythrocytes and acting on leukocytes, which has a pH of 1.5 - 5.0, and an osmolarity of - 120 mOsm/kg and contains a polyoxyethylene based nonionic surfactant represented by the general formula: R1-R2-(CH2CH2O)n-H (where R1 is an alkyl alkenyl or alkynyl, group having 12 - 22 carbon atoms; R2 is -O- (see formula I) or, -COO-; and n is an integer of 20 - 100) or a reagent for the same purpose, which comprises a first solution which is the reagent described above and a second solution to be added to the first solution, and is a pH of 5.0 - 12.0 and has an osmolarity of 150 - 2000 mOsm/kg after addition of the second …
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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 12, 1990 and granted June 11, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 2012.
- 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
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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.