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Expired Canadian patentCanada

Sulfate reducing bacteria determination and control

CA 1303985 C · Owner: Conoco Inc. · Inventors: Gawel, Len J.; Ng, Thomas; Odom, James Martin

CIPO record

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Abstract From the Canadian patent

Sulfate reducing bacteria are detected by preparing a lysate so as to release an enzyme essential to derive energy by reduction of sulfate such as adenosine 5'-phosphosulfate reductase (APS reductase) contacting the lysate with an antibody for the enzyme and detecting, the presence of the reaction product of the enzyme and the antibody. In one aspect sulfate reducing bacteria are controlled responsive to such assay. In another aspect, a "test kit" is provided for carrying out the assay.

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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 23, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 23, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 15, 1987
GrantedJune 23, 1992
Term endedJune 23, 2009
Patent numberCA 1303985 C
Classification (IPC)G01N33/56 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedDec 15, 1987Patent grantedJune 23, 1992Term endedJune 23, 2009

Sources & verification

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