Copper tubing

Pipes and tubular conduits – Miscellaneous

Reexamination Certificate

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Details

C428S586000, C072S253100

Reexamination Certificate

active

06655415

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to copper tubing produced by continuous extrusion apparatus.
BACKGROUND OF THE INVENTION
WO96/29162 discloses continuous extrusion apparatus for the production of copper tubing having a rotatable wheel formed with a plurality of circumferential grooves provided with exit apertures in a die top and abutments displaced in the direction of rotation from the exit apertures.


REFERENCES:
patent: 4238221 (1980-12-01), Sevensson
patent: 4462234 (1984-07-01), Fiorentino et al.
patent: 4598567 (1986-07-01), Backus
patent: 5119660 (1992-06-01), Koppinen et al.
patent: 5152163 (1992-10-01), Hawkes et al.
patent: 5284428 (1994-02-01), Sinha et al.
patent: 5595084 (1997-01-01), Yano
patent: 5813270 (1998-09-01), Carter
patent: 2002/0121121 (2002-09-01), Dawson et al.
patent: 0 398 747 (1990-11-01), None
patent: 0 822 016 (1998-02-01), None
patent: 2 078 584 (1982-01-01), None
patent: 2 103 527 (1983-02-01), None
patent: 2 209 295 (1989-05-01), None
patent: 2 326 121 (1998-12-01), None
patent: 57-159213 (1982-10-01), None
patent: 59-223113 (1984-12-01), None
International Search Report (4 pgs.) for PCT/GB00/03933, dated Feb. 6, 2001.

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