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Dental crown, coated on the front with enamel, made of noble metal or noble metal material and process for its production

US 1,892,490 A · Inventors: RUDOLF HEJCMANN

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Why it's free to use

  • Granted December 27, 1932. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 27, 1949.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJuly 31, 1931
GrantedDecember 27, 1932
Term endedDecember 27, 1949
Application number—
Classification (CPC)A61C5/70 +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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