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Expired Canadian patentCanada

Semiconductor wafer processing to increase the usable planar surface area

CA 2432300 C · Owner: Origin Energy Solar Pty Ltd · Inventors: Weber, Klaus Johannes; Blakers, Andrew William

CIPO record

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Abstract From the Canadian patent

The invention provides a method for increasing the usable surface area of a semiconductor wafer having a substantially planar surface and a thickness dimension at right angles to said substantially planar surface the method , including the steps of selecting a strip thickness for division of the wafer into a plurality of strips, selecting a technique for cutting the wafer into the strips at an angle to the substantially planar surface in which the , combined strip thickness and width of wafer removed by the cutting is less than the thickness of the wafer, cutting the wafer into strips using the selected technique and separating the strips from each other.

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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 November 29, 2001 and granted April 19, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2021.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2023.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 29, 2001
GrantedApril 19, 2011
Term endedNovember 29, 2021
Patent numberCA 2432300 C
Classification (IPC)H01L21/30 +2 more

Timeline

Timeline From CIPO dates

2002200420062008201020122014201620182020Application filedNov 29, 2001Patent grantedApril 19, 2011Term endedNov 29, 2021

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