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Cold rolled steel sheet having stabilized thin oxide film and having excellent resistance against corrosion particularly initial rust formation as well as against corrosion after lacquering

US 3,704,181 A · Inventors: NISHIHARA TOSHIRO 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 November 28, 1972. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by November 28, 1989.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMay 19, 1970
GrantedNovember 28, 1972
Term endedNovember 28, 1989
Application number—
Classification (CPC)C22C38/16 +1 more
Length9 pages

Timeline

Timeline From USPTO dates

1971197319751977197919811983198519871989Application filedMay 19, 1970Patent grantedNov 28, 1972Term endedNov 28, 1989

Sources & verification

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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