Chromogenic cryptahemispherands and their use in detecting electrolytes in an aqueous test sample
CA 1290750 C · Owner: Kumar, Anand · Inventors: Leong, Koon-Wah; Czech, Bronislaw P.; Gebauer, Carl R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention resides in the discovery of a new class of compounds defined herein as "chromogenic cryptahemispherands" useful for the measurement of ions in, particular, ions in aqueous solution which have the structure, wherein:, R, same or different is hydrogen, lower alkyl, lower, alkylidene lower alkenyl, allyl or aryl;, R', same or different is lower alkyl, lower alkylidene, lower alkenyl allyl or aryl;, R", same sr different, is hydrogen lower alkyl, lower, alkylidene, lower alkenyl allyl or aryl;, Q is a chromogenic moiety capable of providing the appearance of or change in color, or which is otherwise capable of providing a detectable response in the presence of a particular …
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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 15, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 15, 2008.
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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.