Parison and blow molding method for bottle having undercut

Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...

Reexamination Certificate

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C428S035700, C428S542800

Reexamination Certificate

active

06872354

ABSTRACT:
A parison (110) for a container having a substantially constant wall thickness, the container having a base, a top edge defining a round opening, the top edge defining a plane which is not parallel to the plane of the base, a neck portion disposed at the same angle as the plane defined by the top edge, a front outer surface, and a rear outer surface having a lower portion and an upper portion. The parison comprises a cylindrical upper neck portion (140) having a cavity extending therethrough, the upper nock having a top surface (145) edge defining a top plane. The parison also has a hollow, elongated body portion (150) having a closed lower end (155) and an upper end (160), the lower body portion having a major axis extending in a direction parallel to the longitudinal axis of the cylindrical upper neck portion, and having a front wall (170) and a rear wall (175). The front wall is thicker than said rear wall. Also included in the invention is a method of producing a bottle (100) from the parison.

REFERENCES:
patent: 4054629 (1977-10-01), Wang et al.
patent: 5346665 (1994-09-01), Watanabe et al.
PCT International Search Report of International Application No. PCT/US00/41282.

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