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Device for increasing boiler efficiency

US 1,399,236 A · Inventors: OKIYE YAMASHITA

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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 6, 1921. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 6, 1938.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledSeptember 11, 1919
GrantedDecember 6, 1921
Term endedDecember 6, 1938
Application number—
Classification (CPC)F23M9/00
Length3 pages

Timeline

Timeline From USPTO dates

1920192219241926192819301932193419361938Application filedSep 11, 1919Patent grantedDec 6, 1921Term endedDec 6, 1938

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

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comJustia PatentsFull text, claims and classification.patents.justia.comFreePatentsOnlineFull text and PDF.freepatentsonline.comEspacenetForeign family and legal status.European Patent Office

Everything on this page comes from the USPTO record linked above.