The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 1989
Filed:
May. 05, 1988
Milton P Chernack, West Hempstead, NY (US);
E-Z-EM, Inc., Westbury, NY (US);
Abstract
A hypodermic syringe assembly includes an elongated container and a cup shape molded piston longitudinal movable in the container. The container has a sidewall, a needle receiving end, and a piston receiving end which terminates in a rim. The piston has an open rear end with at least three equally spaced integral hinged tabs therearound. The piston has a first position partially inserted at the container rear where the tabs extend radially outward from the container adjacent its rear end. The piston in this position can receive a disc shaped plunger head. The piston has a second position fully inserted in the container where the tabs are rotated about their hinges and extend radially inward within the container. In this position the piston tabs hold a disc shaped plunger head within the piston. The piston has a third position partially extended out of the rim of the dispensing container. In this position the tabs are rotated about the hinges and extend radially outward sufficient to permit the plunger head to withdraw from the piston. The sidewall of the dispensing container holds the tabs in a radially inward position in all fully inserted longitudinal positions of the piston.