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Flow valve

US 2,184,635 A · Inventors: CRICKMER CHARLES S et al.

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1 drawing sheet

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Listed from its USPTO record in Patent Yard's full-term archive. Its claims, description and drawings are in the USPTO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Granted December 26, 1939. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 26, 1956.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMarch 5, 1938
GrantedDecember 26, 1939
Term endedDecember 26, 1956
Application number—
Classification (CPC)E21B43/123
Length4 pages

Sources & verification

Official USPTO records

Full published documentText and every drawing sheet as a PDF.USPTOFile historyStatus, office actions, notices, fee records and petitions.USPTO Patent CenterPatent Public Search recordSearchable full text and bibliographic data.USPTO

Cross-check elsewhere

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