IPIQ

GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

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Y10

TECHNICAL SUBJECTS COVERED BY FORMER USPC

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Y10T

TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

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137/00

Fluid handling

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Y10T137/7722

Line condition change responsive valves

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Y10T137/7837

Direct response valves [i.e., check valve type]

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Y10T137/7859

Single head, plural ports in parallel

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Y10T137/7861

Annular head

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Y10T137/7862

Central post on seat

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Patent classifications