(19)
(11) EP 0 468 230 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.11.1992 Bulletin 1992/48

(43) Date of publication A2:
29.01.1992 Bulletin 1992/05

(21) Application number: 91110886.8

(22) Date of filing: 01.07.1991
(51) International Patent Classification (IPC)5: E21B 29/00
(84) Designated Contracting States:
AT DE DK ES FR GB GR IT NL SE

(30) Priority: 25.07.1990 GB 9016311

(71) Applicant: The Red Baron (Oil Tools Rental) Limited
Altens Aberdeen AB1 4PG (GB)

(72) Inventor:
  • Lau, Werner
    GB-Cults, Aberdeen (GB)

(74) Representative: Frankland, Nigel Howard et al
FORRESTER & BOEHMERT Franz-Joseph-Strasse 38
80801 München
80801 München (DE)


(56) References cited: : 
   
       


    (54) A mill or other metal cutting tool


    (57) A metal cutting tool is made by taking a plate of hard metal carbide, and crushing the plate to form a mosaic consisting of a plurality of irregularly sized and irregularly shaped platelettes. The platelettes, in the form of a mosaic, are secured to a support surface. The support surface may form a blade protruding radially from a body which forms a mill to cut casing in a well bore.






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