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:
Jan. 18, 1983
Filed:
Mar. 18, 1981
Monty E Vincent, Ann Arbor, MI (US);
Robert E Corbett, Ann Arbor, MI (US);
Gelman Sciences Inc., Ann Arbor, MI (US);
Abstract
The filter device has a housing with elongated top and bottom walls and side walls which taper inwardly from top to bottom. The top wall has extending downwardly therefrom into the housing a generally flat filter membrane support with a quadrangular periphery, a pair of filter membranes being disposed on opposite sides of the support and sealingly bonded to its periphery, the support having a center portion with spaced coplanar surfaces on each side to provide support for the center portion of the filter membranes. The housing is provided with an opening communicating with the space between the two filter membranes and with an opening communicating with the space between the housing and the two membranes. The bottom wall and side walls of the housing are in the form of a unitary molding of organic polymeric material open at its upper end, and the top wall and the downwardly extending filter membrane support is formed of another molding of organic polymeric material bonded about the periphery of the top wall into the open end of the outer molding. Because of such structure the device can be manufactured at relatively low cost and is compact while yet affording a large filtering area.