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Hydrodynamic brake resistance control and cooling system

US 2,226,558 A · Inventors: FITZPATRICK WALTER G

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3 drawing sheets

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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 31, 1940. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 31, 1957.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledNovember 7, 1938
GrantedDecember 31, 1940
Term endedDecember 31, 1957
Application number—
Classification (CPC)E21B19/00 +1 more
Length6 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

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