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Ice grader having vertical rotary cutters

US 3,148,917 A · Inventors: THOMPSON ROY E

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3 drawing sheets

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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 September 15, 1964. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by September 15, 1981.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMay 10, 1961
GrantedSeptember 15, 1964
Term endedSeptember 15, 1981
Application number—
Classification (CPC)E01H5/094
Length7 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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