Plastic article or earthenware shaping or treating: apparatus – With upstream screen or perforated plate for straining,...
Reexamination Certificate
2006-07-18
2006-07-18
Del Sole, Joseph S. (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
With upstream screen or perforated plate for straining,...
C425S382400, C425S380000, C425S467000, C425S381200
Reexamination Certificate
active
07077639
ABSTRACT:
An mandrel for extrusion of hollow bodies, such as, polyvinyl chloride (PVC) hard, compact, and foamed pipes, includes an inner collar and an outer collar, and webs radially joining the inner collar and outer collar. The webs can be arranged twisted and/or offset in radial direction.
REFERENCES:
patent: 1679545 (1928-08-01), Roth
patent: 1809837 (1931-06-01), Ewart
patent: 4268239 (1981-05-01), Herrington, Jr.
patent: 29813412 (1998-07-01), None
W. Michaeli; Extrusionswerkzeuge für Kunststoffe und Kautschuk S. 156/157.
Dohmann Heinrich
Witt Reinhard
American Maplan Corporation
Del Sole Joseph S.
Hamilton Brook Smith & Reynolds P.C.
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