Transverse fins spaced along conduit

Patents Grantslast 30 patents

  • Information Patent Grant

    3687194

    • Patent number 3,687,194
    • Issue date Aug 29, 1972
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    3373803

    • Patent number 3,373,803
    • Issue date Mar 19, 1968
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    2680601

    • Patent number 2,680,601
    • Issue date Jun 8, 1954
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    1854278

    • Patent number 1,854,278
    • Issue date Apr 19, 1932
    • F28 - HEAT EXCHANGE IN GENERAL

Patents Applicationslast 30 patents