Abstract: A container with an externally threaded neck portion is adapted to be closed with a closure having an internally threaded sidewall engaging the threads of the neck portion. The threads of the neck portion have at least a lower stop disposed at the inner end of the thread. The threads on the container neck are divided; the threads have a maximum pitch of 8 degrees. The stop on the thread on the neck portion and a stop on one part of the divided thread on the closure insure that the closure is stopped at a predetermined position relative to the container after full-threaded rotation of the closure onto the threaded neck portion has been carried out. The threads on the closure are divided by symmetrically disposed gaps. An anti-rotational stop is provided forcibly to retain the closure in its final, fully applied position while permitting the closure to be removed by the application of an initial relatively high torque.

Abstract: A container with a threaded neck portion is adapted to be closed with a closure engaging the threads of the neck portion. The threads of the neck portion have at least two stops disposed at opposite ends of the threads. The threads may be continuous or interrupted but have a maximum pitch of 8 degrees. The two stops of the threads on the neck portion insure that the closure is stopped at a predetermined position relative to the container after full-threaded rotation of the closure onto the threaded neck portion has been carried out.

Abstract: A child-resistant package characterized by a container with a threaded neck portion, a closure provided with a multiplicity of threads cooperatively engaging the threads on the neck portion, means connected to the threaded neck portion for stopping the threading rotation of the closure onto the threaded neck portion at a predetermined position, and resilient liner means interposed between the underside of the top of the closure and the top of the neck portion.

Abstract: A two-piece, twist-on, twist off closure which permits fluids to be dispensed from a container. The two-piece closure includes an insert which can be fastened to a container, a post located in the center of the insert, and a sleeve which fits onto the outside of the insert and has a hole in the center thereof for receipt of the post to form a seal therewith.