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Expired Canadian patentCanada

Determination of blood ammonia levels

CA 1338430 C · Owner: Kasal, Charles Anton · Inventors: Kasal, Charles Anton; Yost, David Anthony; Hissami, Obaid

CIPO record

Overview

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A method and kit for determining the amount of ammonia in a body fluid. The method and kit involve contacting the fluid with glutamate dehydrogenase alpha-ketoglutarate and, nicotinamide hypoxanthine dinucleotide phosphate and determining the amount of ammonia present in the fluid.

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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 July 2, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 2, 2013.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 20, 1989
GrantedJuly 2, 1996
Term endedJuly 2, 2013
Patent numberCA 1338430 C
Classification (IPC)C12Q1/32 +1 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedJuly 20, 1989Patent grantedJuly 2, 1996Term endedJuly 2, 2013

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.