Liquid dispenser

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5232664
SERIAL NO

07762327

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A dispenser which can deliver precise small amounts of a liquid is disclosed. The dispenser is particularly suited to applying reagents in a biological test such as an immunoassay. It includes a reservoir chamber linked to a dispense chamber via a check valve, the two chambers preferably being in the form of syringes. An outlet line leading from the dispense chamber to a nozzle includes a delay check valve (preferably a ball inside a cylindrical chamber) which allows continuous outward flow, but shuts off flow in the reverse direction after allowing a predetermined volume to pass. The process of refilling the dispense chamber from the reservoir chamber creates reverse flow in the nozzle and causes a hanging drop of liquid at the tip of the nozzle to be withdrawn.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
VENTANA MEDICAL SYSTEMS, INC.TUCSON, AZ192

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
DeGroff, Michael J Tucson, AZ 4 329
Krawzak, Thomas P Leominster, MA 1 133
McGraw, Brian J Tucson, AZ 2 151
Nunnery, David W Tucson, AZ 4 221

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