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Heat-recovering air-control device for furnaces

US 1,530,809 A · Inventors: BOWMAN OLIVER S

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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 March 24, 1925. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by March 24, 1942.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledNovember 7, 1922
GrantedMarch 24, 1925
Term endedMarch 24, 1942
Application number—
Classification (CPC)F28D21/0008
Length4 pages

Timeline

Timeline From USPTO dates

1923192519271929193119331935193719391941Application filedNov 7, 1922Patent grantedMarch 24, 1925Term endedMarch 24, 1942

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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

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