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2 021 466

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C1

(51)

IPC

(21) (22)

Application

4935108/03, 1991-05-12

(22)

Actual filing date

1991-05-12

(45)

Published

1994-10-15

(72)

Inventor

Nered N.T.Klejn A.I.

(73)

Holder

Nered Nikolaj TrofimovichKlejn Aleksandr Ivanovich

METHOD FOR ROLLER-CUTTER DRILL BIT BREAK-IN Russian patent published in 1994 - IPC

Abstract RU 2021466 C1

FIELD: manufacture of drill bits. SUBSTANCE: preliminary break-in of roller cutter drill bits is carried out in drilling holes in soft and medium-hard rocks. EFFECT: higher efficiency.

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RU 2 021 466 C1

Authors

Nered N.T.

Klejn A.I.

Dates

1994-10-15—Published

1991-05-12—Filed

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