Patent Yard Sign in
Expired Canadian patentCanada

X-ray target having high z particles imbedded in a matrix

CA 2236792 C · Owner: Varian Associates, Inc. · Inventors: Virshup, Gary Fredric; Reynolds, Glyn Jeremy

CIPO record

Overview

Drawings and full text

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

Open the CIPO record

Abstract From the Canadian patent

A rotating anode X-ray target has a matrix structure such as a carbon-carbon matrix and a high Z material imbedded inside this matrix structure. The high Z material may be a refractory metal with atomic number at least 72 its alloy , or carbide and may be imbedded in the matrix either as discrete particles or as a non-discrete layer. Such a target can be made by any of a number of known methods such as chemical vapor deposition and chemical vapor infiltration. Without a TZM layer or a braze required for holding together an X-rayproducing surface layer and a carbon heat storage material the target can be , made lighter and can be operated at higher temperatures.

Read the whole patent

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 September 9, 1997 and granted August 27, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 9, 2017.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 9, 2019.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 9, 1997
GrantedAugust 27, 2002
Term endedSeptember 9, 2017
Patent numberCA 2236792 C
Classification (IPC)H01J35/08 +1 more

Timeline

Timeline From CIPO dates

1998200020022004200620082010201220142016Application filedSep 9, 1997Patent grantedAug 27, 2002Term endedSep 9, 2017

Sources & verification

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