Liquid feeding device

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 12092099
APP PUB NO 20210156376A1
SERIAL NO

16612380

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Importance

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Abstract

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A liquid feeding device includes a primary plunger pump; a secondary plunger pump connected downstream; a check valve provided between the primary plunger pump and the secondary plunger pump; a primary pressure sensor that detects a pressure in the pump chamber of the primary plunger pump; a liquid feeding control part configured to control operations of the primary plunger pump and the secondary plunger pump; and a liquid leakage detector configured to detect liquid leakage in the check valve based on a change in an output value of the primary pressure sensor during the waiting time. The liquid feeding control part is configured to control the operation of the primary plunger pump so that a waiting time, where the primary plunger pump stops without operating, is present while a discharge operation by the secondary plunger pump is performed after a suction by the primary plunger pump is completed.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
SHIMADZU CORPORATION1 NISHINOKYO-KUWABARACHO NAKAGYO-KU KYOTO 604

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Imamura, Shinya Kyoto, JP 109 650
Ogawa, Keisuke Kyoto, JP 63 123

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