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Apparatus used in the process of heat treating metallic articles

US 1,850,576 A · Inventors: COLUMBUS ZIMMERMAN LEON

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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 22, 1932. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by March 22, 1949.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJune 30, 1926
GrantedMarch 22, 1932
Term endedMarch 22, 1949
Application number—
Classification (CPC)C23C10/28
Length5 pages

Timeline

Timeline From USPTO dates

19271930193319361939194219451948Application filedJune 30, 1926Patent grantedMarch 22, 1932Term endedMarch 22, 1949

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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

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