Pressure cast concrete or mortar lined steel pipes and...

Details Pressure cast concrete or mortar lined steel pipes and... Pressure cast concrete or mortar lined steel pipes and...

2008-04-02

2011-12-06

Hook, James (Department: 3754)

Pipes and tubular conduits

Reinforced

With embedded element

C138S143000, C138S146000, C138S175000, C138SDIG010, C264S228000, C264S516000

Reexamination Certificate

active

08069880

ABSTRACT:
Pressure cast lined steel pipes comprise an annular concrete or mortar liner along an inside diameter, and a metal shell surrounding the liner, wherein the liner is in direct contact with the metal shell. The wall thickness of the liner can be from 10 to 50 times the thickness of the metal shell. The pipe may be coated with a dielectric material. A mold assembly used to form the pipe includes an annular concrete or mortar composition chamber formed between the metal shell and an inner mold member. Pressurized water is used in the mold assembly to pressurize the concrete or mortar composition and exert a desired pressure force onto the metal shell while the composition cures in the mold. Once a desired degree of cure is achieved, the pressure is removed causing the metal shell to exert a desired compression force onto the cured liner.

REFERENCES:
patent: 2474660 (1949-06-01), Fitzpatrick
patent: 4247516 (1981-01-01), Morgan
patent: 5791378 (1998-08-01), Stephens
patent: 6076562 (2000-06-01), Kuo
patent: 6174569 (2001-01-01), Blomer et al.
patent: 1264614 (1961-06-01), None
International Search Report and Written Opinion for corresponding International Application No. PCT/US2009/039091 dated Dec. 16, 2009; total 14 pages.
International Preliminary Report of Patentability (IPRP) for corresponding International Application No. PCT/US2009/039091 dated Feb. 24, 2011; total 9 pages.

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