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:
Dec. 20, 1988
Filed:
Aug. 10, 1987
Vernon W Klein, Kansas City, MO (US);
Marion Laboratories, Inc., Kansas City, MO (US);
Abstract
A manual liquid filtration device includes a housing having an open lower end providing access to an internal vacuum chamber, and defining a liquid specimen receiving chamber at its upper end adapted for flow communication with the vacuum chamber. An elastic diaphragm extends across the lower open end of the housing and upwardly along its outer peripheral surface so as to cooperate with air orifices in the housing to define valve means enabling unidirectional air flow from the vacuum chamber. A porous membrane filter element is interposed between the specimen receiving chamber and the vacuum chamber and when dry enables air to pass therethrough from the vacuum chamber upon flexing of the diaphragm into the vacuum chamber. When wetted by water, the filter element maintains vacuum in the vacuum chamber but enables liquid from a liquid specimen to be drawn through the filter element so as to retain solid particulate on the filter element for diagnosis or further reagent washing.