Process for the production of piping made of a cementitious...

Details Process for the production of piping made of a cementitious... Process for the production of piping made of a cementitious...

2006-12-06

2011-12-06

Del Sole, Joseph (Department: 1743)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

Reexamination Certificate

active

08070997

ABSTRACT:
The present invention relates to a process for the production by extrusion of piping made of a cementitious material having a circular section and fine thickness, suitable for the channeling of liquids and gases at atmospheric operating pressure or slightly higher.

REFERENCES:
patent: 3358342 (1967-12-01), Spence
patent: 3549737 (1970-12-01), Schulze
patent: RE27061 (1971-02-01), Rubenstein
patent: 5891374 (1999-04-01), Shah et al.
patent: 6398998 (2002-06-01), Krenchel et al.
patent: 2007/0181201 (2007-08-01), Baker et al.
patent: 1220310 (1966-06-01), None
patent: 957496 (1964-05-01), None
patent: 01-160612 (1989-06-01), None
patent: WO 93/20990 (1993-10-01), None
patent: WO 2005/050079 (2007-03-01), None
PCT Search Report Dated Mar. 29, 2007.

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