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N-halogenated sulfonic acids and alkali metal salts thereof

US 3,654,348 A · Inventors: HARDY FREDERICK EDWARD et al.

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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 April 4, 1972. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by April 4, 1989.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledOctober 9, 1968
GrantedApril 4, 1972
Term endedApril 4, 1989
Application number—
Classification (CPC)C11D3/3955
Length6 pages

Timeline

Timeline From USPTO dates

1969197219751978198119841987Application filedOct 9, 1968Patent grantedApril 4, 1972Term endedApril 4, 1989

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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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