Abstract: An improved linerless plastic closure includes a top panel that has external and internal surfaces and a generally cylindrical sidewall that is unitary with the top panel and has an internally threaded surface that is adapted to engage with a threaded finish portion of a container. A shoulder portion is defined between the internal surface of the top panel and the internal surface of the sidewall. A linerless sealing member extends radially inwardly from the shoulder portion. A first radius is defined in the shoulder portion between the linerless sealing member and the internal surface of the top panel. A second radius is defined in the shoulder portion between the linerless sealing member and the internal surface of the sidewall. But the first and second radii are preferably configured to be at least 0.020 inches, which has been found to reduce the potential for stress-related cracking.

Abstract: A plastic closure for a container includes an upper wall and a generally cylindrical sidewall that depends downwardly from the upper wall: The generally cylindrical sidewall has a threaded internal surface so that it may be screwed onto a container neck. The closure further includes an annular sealing plug that depends downwardly from a lower surface of the upper wall. The annular sealing plug has an inner annular surface that when viewed in longitudinal cross-section extends at a first angle with respect to a longitudinal axis of said closure and an outer annular surface that when viewed in longitudinal cross-section extends at a second angle with respect to the longitudinal axis. The first angle is advantageously greater than the second angle, creating a tapered profile that improves moldability of the closure.

Abstract: A plastic closure for a container includes a top wall and a downwardly depending substantially cylindrical skirt that is unitary with the top wall. The skirt defines inner and outer surfaces as well as a lower rim at a distal, bottom end thereof. In addition, at least one thread is defined on the inner surface of the skirt. Most advantageously, reinforcing structure is provided on the skirt an area between the lower rim and a lowermost thread of the inner surface for enhancing the dimensional integrity of the closure during opening.

Abstract: A container assembly includes a container that has an externally threaded finish portion as well as retention structure for preventing upward movement of a tamper evident band. The container assembly further includes a closure having a body portion of a base and an internally threaded downwardly depending sidewall portion that is sized and shaped to screw onto the finish portion of the container. The closure further includes a tamper evident band that is frangibly connected to the sidewall portion and that includes a main band portion and a J-hook retention member. The J-hook retention member includes a plurality of pleated retaining flaps, each of which has upper portion for engaging the retention structure.