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2 017 839

(13)

C1

(51)

IPC

(21) (22)

Application

4864731/02, 1990-09-10

(22)

Actual filing date

1990-09-10

(45)

Published

1994-08-15

(72)

Inventor

Vydrevich L.A.Zhuravskij S.M.Melikjan G.A.Timofeev A.G.

(73)

Holder

Tsentral'Nyj Nauchno-Issledovatel'Skij Institut Materialov

PROCESS OF HARDENING SEWING AND DOMESTIC NEEDLES Russian patent published in 1994 - IPC

Abstract RU 2017839 C1

FIELD: metallurgy. SUBSTANCE: process of cooling needles in hardening medium is to be run in two steps. First prescribes cooling freely dropping needles in hardening medium to temperature which is below martensite transformation start point (5 to 10 C). Second step is allowing needles conveyed by hardening reservoir conveyor to cool to hardening medium temperature. EFFECT: more advanced technique. 1 dwg

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RU 2 017 839 C1

Authors

Vydrevich L.A.

Zhuravskij S.M.

Melikjan G.A.

Timofeev A.G.

Dates

1994-08-15—Published

1990-09-10—Filed

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