Vacuumized receptacle for sample collection
AssigneeEvans Components, Inc.
InventorRobert W. Evans
Life of this patent
Estimating the term…
Abstract
A portable receptacle is vacuumized for use in taking an air or gas sample for subsequent examination to determine type, origin, components of the air or gas. Critical to a long shelf life of the vacuumized receptacle is a valve which virtually seals the receptacle for months or years permitting storage of the receptacle in a state ready for immediate use at a site. The valve utilizes a positionable member plated with a noble metal. A filter serves to collect particulate from the air or gas flow into the receptacle. A funnel shaped collector aids in the collection.
Claims19
In a vacuumized vessel, the improvement comprising:
- a valve including a positionable ball member mounted within the valve to rotate from an opened to a closed position, the ball member having an external coating of a noble metal and non-metallic seats that sealingly cooperate with the external coating when the ball member is in the closed position.
A receptacle for vacuumizing for subsequent collection of a sample of air or a gas for purposes of evaluation and comprising:
- a portable main body defining a chamber,
- a valve assembly on said portable main body including a control for admitting ambient air or a gas into the chamber, a valve member alternately positionable in a first and a second position, having an outermost surface of a noble metal configured to cooperate with a synthetic fluoropolymer seat to effect a seal thereby to maintain the receptacle in a vacuumized state when stored for a lengthy duration prior to the collection of a sample, and
- a filter assembly on said valve assembly in communication with an inlet serving said chamber, and including a filter element on which airborne particulate of the sample may be collected.
A portable vacuumized receptacle having a reservoir and comprising:
- a valve having a ball member moveable from a first to a second position, the first position opening a valve passageway to communicate the reservoir with the ambient, the ball member having an exterior outermost surface of a noble metal, the ball member being configured to cooperate with a synthetic flouropolymer seat to effect a seal isolating the reservoir from the ambient in the second position.
A valve having a movable ball element comprising,
- a control coupled to the ball element;
- and
- a synthetic flouropolymer valve seat biased into sealing contact with the ball element, the ball element having a noble metal external outermost surface.
A valve for selectably containing a vacuum, the valve comprising:
- a synthetic flouropolymer valve seat;
- and
- a valve member to sealingly cooperating with the synthetic flouropolymer valve seat having a valve passageway, said valve member including an outermost surface of noble metal.
Dependencies are inferred from the claim text.