(19)
(11) EP 0 996 809 A2

(12)

(88) Date of publication A3:
08.04.1999

(43) Date of publication:
03.05.2000 Bulletin 2000/18

(21) Application number: 98934415.5

(22) Date of filing: 10.07.1998
(51) International Patent Classification (IPC)7: E21B 10/62, E21B 10/54, E21B 10/58, E21B 10/46
(86) International application number:
PCT/US9814/358
(87) International publication number:
WO 9904/128 (28.01.1999 Gazette 1999/04)
(84) Designated Contracting States:
DE GB

(30) Priority: 15.07.1997 US 893059
01.07.1998 US 108181

(71) Applicant: KENNAMETAL INC.
Latrobe, PA 15650 (US)

(72) Inventors:
  • MASSA, Ted, R.
    Latrobe, PA 15650 (US)
  • SIDDLE, David, R.
    Greensburg, PA 15601 (US)

(74) Representative: Sties, Jochen, Dipl.-Ing. et al
Prinz & PartnerPatentanwälteManzingerweg 7
81241 München
81241 München (DE)

   


(54) ROTATABLE CUTTING BIT ASSEMBLY WITH CUTTING INSERTS