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Expired Canadian patentCanada

Method of and device for determining a radiation absorption distribution in a part of a body

CA 1138132 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Op De Beek, Johannes C.A.

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Abstract From the Canadian patent

7.8.79 1 PHB.9385, "ABSTRACT":, "Method of and device for determing a radiation absorption distribution in a part of a body". The invention relates to a method of and a device for determining a radiation absorption distribution in a part of a body. Per measuring value a contribution of the absorption value in each element of a matrix imagined in the part is calculated. It is demonstrated that this contribution equals the value of the measuring value multiplied by a weighting factor. The weighting factor is a function of the distance between the element and the measuring path along which the measuring value is determined. A calculation method of this kind enables fast on-line calculation of …

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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 December 21, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 21, 1999.
  • 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 13, 1980
GrantedDecember 21, 1982
Term endedDecember 21, 1999
Patent numberCA 1138132 A
Classification (IPC)G01T1/00 +2 more

Timeline

Timeline From CIPO dates

1981198319851987198919911993199519971999Application filedMarch 13, 1980Patent grantedDec 21, 1982Term endedDec 21, 1999

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