Computer generated stopper

Details Computer generated stopper Computer generated stopper

1986-12-29

1988-05-03

Marcus, Stephen

Bottles and jars

Closures

Self-sealing, piercable-type closure

215DIG3, B65D 4736

Patent

active

047414464

ABSTRACT:
A stopper or closure is provided as a closure for containers in which the stopper profile is computer generated to take into consideration radial stress at the stopper/container interface, and to eliminate tensile stress therealong which tensile stress is an indication that a portion of the stopper wall is not engaging the opposed container surface. The stopper of the invention is particularly appropriate for use in evacuated blood sample collection tubes for eliminating "gray bands" or regions where the stopper and tube do not contact, and "red spots" formed in small cavities generated on the internal surface of the stopper at the withdrawal position of a blood collection needle having been inserted in the stopper.

REFERENCES:
patent: 1509916 (1924-09-01), Waite
patent: 3136440 (1964-06-01), Krug et al.
patent: 3974930 (1976-08-01), Gizard et al.
patent: 4111326 (1978-09-01), Percarpio
patent: 4136794 (1979-01-01), Percarpio
patent: 4186840 (1980-02-01), Percarpio
patent: 4187952 (1980-02-01), Percarpio
patent: 4301936 (1981-11-01), Percarpio
patent: 4465200 (1984-08-01), Percarpio

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