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Method and apparatus for the highspeed carbonisation of solid fuels of small particle size,such as coal

US 3,535,209 A · Inventors: LEDENT PIERRE

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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 October 20, 1970. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by October 20, 1987.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJuly 1, 1968
GrantedOctober 20, 1970
Term endedOctober 20, 1987
Application number—
Classification (CPC)C10B49/22 +2 more
Length3 pages

Timeline

Timeline From USPTO dates

1969197119731975197719791981198319851987Application filedJuly 1, 1968Patent grantedOct 20, 1970Term endedOct 20, 1987

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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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