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Process of metal treatment

US 1,987,481 A · Inventors: LAUENSTEIN CARL F

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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 January 8, 1935. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by January 8, 1952.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledFebruary 17, 1930
GrantedJanuary 8, 1935
Term endedJanuary 8, 1952
Application number—
Classification (CPC)—
Length6 pages

Timeline

Timeline From USPTO dates

19311934193719401943194619491952Application filedFeb 17, 1930Patent grantedJan 8, 1935Term endedJan 8, 1952

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

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