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Expired Canadian patentCanada

Circular nucleic acid vectors, and methods for making and using the same

CA 2494772 C · Owner: Chen, Zhi-Ying · Inventors: Chen, Zhi-Ying; Kay, Mark A.

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Abstract From the Canadian patent

Circular nucleic acid vectors that provide for persistently high levels of protein expression are provided. The circular vectors of the subject invention are characterized by being devoid of expression-silencing bacterial sequences where in many embodiments the subject vectors include a unidirectional sitespecific recombination product hybrid sequence in addition to an expression cassette. Also provided are methods of using the subject vectors for introduction of a nucleic acid, e.g. an expression cassette into a target , cell, as well as preparations for use in practicing such methods. The subject methods and compositions find use in a variety of different applications including both …

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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

  • Filed August 28, 2003 and granted December 1, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2023.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2025.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 28, 2003
GrantedDecember 1, 2015
Term endedAugust 28, 2023
Patent numberCA 2494772 C
Classification (IPC)C12N15/63 +2 more

Timeline

Timeline From CIPO dates

2004200620082010201220142016201820202022Application filedAug 28, 2003Patent grantedDec 1, 2015Term endedAug 28, 2023

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