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:
Jul. 21, 2009
Filed:
Jul. 05, 2004
Jeremy Marshall, Oxford, GB;
Steven Mark Guy Rolfe, Oxon, GB;
Jeremy Marshall, Oxford, GB;
Steven Mark Guy Rolfe, Oxon, GB;
Owen Mumford Limited, Woodstock, Oxfordshire, GB;
Abstract
A syringe () is moved bodily forward by a plunger () (after release of a spring) by acting through an O-ring pressing onto an enlarged head () of a syringe container (), in order to expose the needle () of the syringe before the plunger acts on a plug () within the syringe to cause the liquid to be ejected through the needle. There is, therefore, a two-step movement of the plunger, firstly together with the syringe through the medium of the O-ring, and secondly within the syringe container to force the plug forward, when a ledge () on the syringe container () is arrested by a stop (), whereupon the frictional force between the plunger and the O-ring is relieved so that the plunger slides forward through the O-ring.