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Starch-modified thermosetting melamine formaldehyde acid colloid and paper having dry strength made therewith

US 3,594,271 A · Inventors: WOODBERRY NORMAN THORNDIKE

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Why it's free to use

  • Granted July 20, 1971. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by July 20, 1988.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJuly 19, 1968
GrantedJuly 20, 1971
Term endedJuly 20, 1988
Application number—
Classification (CPC)C08L61/28 +2 more
Length3 pages

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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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