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Process of improving the basic dye acceptance of acrylonitrile-polymer containing fibers by using an alkaryl polyethoxy phosphate ester

US 3,575,944 A · Inventors: STROH ERNEST F

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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 20, 1971. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by April 20, 1988.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledDecember 27, 1966
GrantedApril 20, 1971
Term endedApril 20, 1988
Application number—
Classification (CPC)C08K5/524 +2 more
Length3 pages

Timeline

Timeline From USPTO dates

19671970197319761979198219851988Application filedDec 27, 1966Patent grantedApril 20, 1971Term endedApril 20, 1988

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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