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Expired Canadian patentCanada

Controlled release fertilizers

CA 2194272 C · Owner: Tempero Controlled Release Technologies Ltd. · Inventors: Yaniv, Itzhak

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

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Abstract From the Canadian patent

Controlled-release fertilizers comprise one or more water-soluble fertilizer(s) together with improved magnesite cements comprising cements , selected from magnesium oxychloride and/or magnesium oxysulphate together with one or more organic carboxylic acid(s) and/or their carboxylate salts and/or their acid anhydrides.

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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.

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Why it's free to use

  • Filed July 5, 1995 and granted September 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 5, 2015.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 2017.
  • 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 5, 1995
GrantedSeptember 5, 2000
Term endedJuly 5, 2015
Patent numberCA 2194272 C
Classification (IPC)—

Timeline

Timeline From CIPO dates

1996199820002002200420062008201020122014Application filedJuly 5, 1995Patent grantedSep 5, 2000Term endedJuly 5, 2015

Sources & verification

Official CIPO records

Canadian Patents DatabaseClaims, description, documents and status.CIPO

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