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Process of making pipes of cement

US 1,441,908 A · Inventors: LEON BILLE

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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 9, 1923. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by January 9, 1940.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJanuary 24, 1920
GrantedJanuary 9, 1923
Term endedJanuary 9, 1940
Application number—
Classification (CPC)B28B21/74
Length5 pages

Timeline

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1921192319251927192919311933193519371939Application filedJan 24, 1920Patent grantedJan 9, 1923Term endedJan 9, 1940

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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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