|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||215/1C ; 220/70 ; 428/3692 ; 428/5428|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 94 인용 특허 : 14|
An improved preform is disclosed for molding plastic containers having a self-supporting base structure. The preform has a reinforcing section of concentric annular ribs near its closed end. The wall thickness of the preform is increased in the reinforcing section by a plurality having an increasing thickness in a direction toward the closed end of the preform. When blow molded into a final container, these concentric ribs form annular reinforcing ribs on the inner surface of the container base. These ribs are substantially concentric about the longitudi...
A plastic container comprising an upright hollow body having an upright longitudinal axis, said body having a tubular side wall merging at its lower end with a base structure, said base structure comprising: a bottom wall having an upwardly facing inner surface; a plurality of substantially continuous annular reinforcing ribs on said inner surface, said ribs being generally concentric about said axis and being of increased thickness relative to said tubular side wall, the wall thickness of each rib being greater than the wall thickness of the preceding r...