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:
Aug. 24, 1993
Filed:
Feb. 07, 1992
Balinderjeet S Baidwan, Denver, CO (US);
Eva M Baidwan, Denver, CO (US);
Other;
Abstract
An improved blood drawing syringe characterized by a barrel having a hollow cylindrical bore with an open rear end and a reduced diameter front end for the attachment of a needle, a pushrod disposed for slidable movement within the barrel, a piston attached to the forward end of the pushrod and having a circular disc with spaced apart forward and rear perforated faces enclosing a filter disposed between the faces, a sealing flange disposed around the periphery of the disc sized and dimensioned to fit slidingly within the cylindrical bore of the barrel and a flexible seal abutting the rear face of the disc and adapted to selectively cover the perforations in the rear face of the disc as a function of forward or rearward air pressure on the flexible seal.