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Well anchor comprising pressure operated means engaging the expanding means for preventing movement thereof because of pressure surges inside inner conduit

US 3,211,233 A · Inventors: BROWN JOE R

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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 October 12, 1965. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by October 12, 1982.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledOctober 8, 1962
GrantedOctober 12, 1965
Term endedOctober 12, 1982
Application number—
Classification (CPC)E21B43/10
Length5 pages

Timeline

Timeline From USPTO dates

1963196519671969197119731975197719791981Application filedOct 8, 1962Patent grantedOct 12, 1965Term endedOct 12, 1982

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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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