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Expired Canadian patentCanada

Wavefront calibration analyzer and methods

CA 2521845 C · Owner: Yee, Kingman · Inventors: Persoff, Jeffrey J.; Somani, Seema; Liang, Junzhong

CIPO record

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Abstract From the Canadian patent

A wavefront sensor enhances calibration of a laser ablation system such as a , laser eye surgery system, by measuring one or more characteristics of an ablated test surface. Typically, light is passed through the ablated test surface, and the light is analyzed to determine the test surface characteristics. In some embodiments, the ablated test surface is positioned along a treatment plane. In some embodiments light is passed through a , wavefront sensor such as a Hartmann-Shack sensor, to convert the light into electrical signals. A processor then converts the electrical signals into data, such as surface maps showing high-order aberrations and/or artifacts on the test surface, …

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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 March 12, 2004 and granted May 29, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2024.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2026.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 12, 2004
GrantedMay 29, 2012
Term endedMarch 12, 2024
Patent numberCA 2521845 C
Classification (IPC)B23K26/60 +2 more

Timeline

Timeline From CIPO dates

2005200720092011201320152017201920212023Application filedMarch 12, 2004Patent grantedMay 29, 2012Term endedMarch 12, 2024

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