Process for the preparation of chromogenic cryptahemispherands
CA 1316174 C · Owner: Technicon Instruments Corporation · Inventors: Czech, Bronislaw P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process in which a variety of cryptahemispherands bearing a chromogenic group attached to the partially preorganized moiety may be synthesized. The procedure of the present invention allows preparation of preferred chromogenic cryptanhemispherands of the general formula:, wherein:, R, is same or different is hydrogen, lower alkyl, lower, alkylidene lower alkenyl, allyl, aryl or benzyl;, R' same or different, is lower alkyl, lower alkylidene lower alkenyl, allyl, aryl, or benzyl; R", same or different, is hydrogen, lower alkyl lower, alkylidene, lower alkenyl, allyl aryl, or benzyl;, Z is halogen, Y is an electron withdrawing group e.g. CN, NO2, CF3, COOR;, m is 1 …
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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 April 13, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 13, 2010.
- 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.