Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
1999-07-29
2001-02-13
Dye, Rena L. (Department: 1772)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C428S036920, C428S542800, C215S043000, C215S045000, C215S344000, C264S536000
Reexamination Certificate
active
06187399
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a new and improved blow molded neck construction for bottle or other container, a cap therefor and method of forming said neck. More particularly, it relates to the neck finish for a blow molded plastic bottle characterized by the fact that when used with a cap having a plug (i.e., inner skirt) the surface of the neck against which the plug seals is a seal surface without parting lines and a portion above the seal surface comprises an inward directed thin flexible flange.
2. Description of Related Art
An exemplar of the prior art is U.S. Pat. No. 4,691,834 which shows an upward inward directed flexible flange sealing against the corner of the intersection of the outer wall of the plug and the underside of the top of the cap. The neck sealing surface is, inherently, somewhat uneven and ragged since the neck is cut or sheared adjacent this sealing surface. In the present invention, however, the neck is trimmed at the edge of the upper flexible flange but such edge is not the portion of the neck which seals against the cap plug.
The references cited against said U.S. Pat. No. 4,691,834 are likewise distinguishable.
U.S. Pat. Nos. 4,625,876 and 4,798,301 show curved plug contacting surfaces but these are of substantially the same diameters as the inner edge of the flanges which engage the underside of the top of the cap.
SUMMARY OF THE INVENTION
The bottle of the present invention is blow molded in a split mold by techniques well known in the art. The surfaces of the mold which define the neck structure cause the neck shape hereinafter described. An upper portion of the parison above the neck is trimmed or cut from the neck according to conventional practice (e.g. pull-up trim, spin trim, etc.) The circle at which the upper portion of the parison is severed from the neck is the inner edge of an inward upward slanted flange. The other end of the flange merges into a curved surface which extends inward a greater distance than the aforesaid edge to merge with an internal sealing surface of lesser diameter than said edge. The neck structure above the neck sealing surface has rapidly changing diameters which form a flexible membrane due to parison stretching in the blow molding process. Below the sealing surface the exterior of the neck structure slants downward outward to a horizontal shoulder and then extends downwardly and then outwardly to a second or lower shoulder.
The cap with which the neck is used has a top having a depending central plug or inner skirt, the outer surface of which seals tightly against the sealing surface of the neck. The cap also has an outer skirt having internal sealing beads which engage the upper and lower shoulders of the neck to hold the cap in place. The lower portion of the outer cap skirt may be removed by the user engaging and pulling a pull tab which causes the lower part of the skirt to disengage at a circumferential score line. Until such lower skirt is removed, the cap and neck are tamper-evident.
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Luch Daniel
Repp Richard E.
Sandor Laszlo G.
Dye Rena L.
Flehr Hohbach Test Albritton & Herbert LLP
Portola Packaging, Inc.
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