Patent classifications
Y
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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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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Y10T137/7854
In couplings for coaxial conduits, e.g., drill pipe check valves
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Y10T137/7856
Valve seat formed on or carried by a coupling element
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