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:
Mar. 02, 1976
Filed:
Oct. 18, 1974
Brian E Baldwin, Wilmette, IL (US);
Affiliated Hospital Products, Inc., St. Louis, MO (US);
Abstract
A fluid dispensing arrangement for injecting liquid parenteral drugs or other liquids, including a syringe or cartridge with a needle-hub secured thereto, a plunger in the syringe or cartridge for effecting liquid discharge and injection, and a combination sealing and by-pass valve plug initially in a radially compressed sealing position at the forward end of the cartridge or syringe body or barrel and separating the liquid in the cartridge or syringe body or barrel from the needle-hub assembly, the valve plug being longitudinally forwardly movable to a by-pass discharge position within a by-pass chamber of larger diameter than the normal unrestricted and uncompressed diameter of the plug. The plug has tapered cruciform ends with corresponding circumferentially spaced by-pass grooves formed thereby at its opposite ends to aid in liquid by-pass therepast during liquid discharge or aspirating action.