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Method of providing a wall around a unitary mass of gas-permeable material for constructing a heat exchanger or a regenerator

US 3,383,751 A · Inventors: PETRUS DIRNE ADRIANUS et al.

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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 May 21, 1968. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by May 21, 1985.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
Filed—
GrantedMay 21, 1968
Term endedMay 21, 1985
Application number—
Classification (CPC)F28D17/00 +2 more
Length4 pages

Timeline

Timeline From USPTO dates

196919711973197519771979198119831985Patent grantedMay 21, 1968Term endedMay 21, 1985

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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