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2 091 655

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IPC

(21) (22)

Application

94033638/06, 1994-09-15

(22)

Actual filing date

1994-09-15

(45)

Published

1997-09-27

(72)

Inventor

Blinov Ju.I.Gubin A.I.Bobkov I.A.Tsykalov V.F.Abdrakhmanov G.S.Samarjanov Ju.V.

(73)

Holder

Aktsionernoe Obshchestvo Otkrytogo Tipa Nauchno-Issledovatel'Skij Institut Trubnoj Promyshlennosti"

PROFILED PIPE Russian patent published in 1997 - IPC

Abstract RU 2091655 C1

FIELD: manufacture of pipes. SUBSTANCE: profile is made in form of symmetric combination of three tear-shaped cavities formed from billet; two of them are in contact by outer surfaces of widened portions forming third cavity between them; inner surfaces of two tear-shaped cavities are formed by inner surface of round billet and their outer surfaces are formed by outer surface of round billet. Inner surface of center cavity is formed by outer surface of round billet and outer surface of this cavity is formed by inner surface of round billet. EFFECT: enhanced reliability. 1 dwg

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RU 2 091 655 C1

Authors

Blinov Ju.I.

Gubin A.I.

Bobkov I.A.

Tsykalov V.F.

Abdrakhmanov G.S.

Samarjanov Ju.V.

Dates

1997-09-27—Published

1994-09-15—Filed