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Dry distillation of shale and other slate-shaped materials

US 2,269,025 A · Inventors: ANDREAS JOHANSSON EDVIN

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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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  • Granted January 6, 1942. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by January 6, 1959.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledNovember 28, 1940
GrantedJanuary 6, 1942
Term endedJanuary 6, 1959
Application number—
Classification (CPC)C10B7/14
Length5 pages

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1941194319451947194919511953195519571959Application filedNov 28, 1940Patent grantedJan 6, 1942Term endedJan 6, 1959

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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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