involving more than two upper drums and a single lower drum

Patents Grantslast 30 patents

  • Information Patent Grant

    2126862

    • Patent number 2,126,862
    • Issue date Aug 16, 1938
    • F22 - STEAM GENERATION
  • Information Patent Grant

    2015338

    • Patent number 2,015,338
    • Issue date Sep 24, 1935
    • F22 - STEAM GENERATION
  • Information Patent Grant

    1964412

    • Patent number 1,964,412
    • Issue date Jun 26, 1934
    • F22 - STEAM GENERATION
  • Information Patent Grant

    1929891

    • Patent number 1,929,891
    • Issue date Oct 10, 1933
    • F22 - STEAM GENERATION
  • Information Patent Grant

    1887141

    • Patent number 1,887,141
    • Issue date Nov 8, 1932
    • F22 - STEAM GENERATION
  • Information Patent Grant

    1882422

    • Patent number 1,882,422
    • Issue date Oct 11, 1932
    • F22 - STEAM GENERATION
  • Information Patent Grant

    1832064

    • Patent number 1,832,064
    • Issue date Nov 17, 1931
    • F22 - STEAM GENERATION
  • Information Patent Grant

    1753267

    • Patent number 1,753,267
    • Issue date Apr 8, 1930
    • F22 - STEAM GENERATION
  • Information Patent Grant

    1437495

    • Patent number 1,437,495
    • Issue date Dec 5, 1922
    • F22 - STEAM GENERATION