Ph-indicator composition having controlled change of colour and ph on freezing, and a method for the preparation thereof
CA 1080096 A · Owner: Kockums Chemical Aktiebolag · Inventors: Tiru, Mandayam O.; Tiru, Maj-Britt I.
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Its claims, description and drawings are in the Canadian Patents Database.
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CANADIAN PATENT APPLICATION, OF, MANDAYAM OSURI TIRU and, MAJ-BRITT INGEGERD TIRU, for, A pH-INDICATOR COMPOSITION HAVING CONTROLLED CHANGE OF COLOUR AND pH ON FREEZING, AND A METHOD FOR THE PREPARATION THEREOF. Abstract of the Disclosure This invention relates to a pH-indicator composition comprising a buffer solution containing at least one inorganic ion in solution, such as Na2HP04, which solution displays change of pH upon freezing, and a control agent which by changing the, ionic strength and the proton composition of the solution in the frozen state, affects the pH change. The composition further comprises at least one pH-indicating substance for displaying by colour changes of pH 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 June 24, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 24, 1997.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.