US3812275A
(en )
1974-05-21
Steel production method and apparatus
GB115222A
(https= )
1900-01-01
US2515670A
(en )
1950-07-18
Manufacture of open-hearth steel
GB972335A
(en )
1964-10-14
Improved apparatus for continuous steelmaking
US1524397A
(en )
1925-01-27
Smelting furnace
US94997A
(en )
1869-09-21
Improvement in the mantjtacttjre of xroh asfb bteee
US1255191A
(en )
1918-02-05
Process of producing iron and steel.
US3690632A
(en )
1972-09-12
Blast furnace control based on measurement of pressures at spaced points along the height of the furnace
US1158875A
(en )
1915-11-02
Metal-melting furnace.
US794762A
(en )
1905-07-18
Melting-furnace.
US732269A
(en )
1903-06-30
Metallurgical furnace.
US214572A
(en )
1879-04-22
Improvement in the melting and manufacture of glass
US90926A
(en )
1869-06-08
Improved process of making- cast-steel
US740360A
(en )
1903-09-29
Metallurgical furnace.
US932501A
(en )
1909-08-31
Crucible-furnace.
US903163A
(en )
1908-11-10
Furnace.
US617918A
(en )
1899-01-17
Tipping metallurgical furnace
US2661198A
(en )
1953-12-01
Furnace end structure
US698610A
(en )
1902-04-29
Apparatus for making steel, &c.
US1680155A
(en )
1928-08-07
Fuel-heated furnace and converter using preheated air
US725490A
(en )
1903-04-14
Furnace.
US107712A
(en )
1870-09-27
Improvement in furnaces for smelting scrap-iron
US749460A
(en )
1904-01-12
Electric furnace
US3409A
(en )
1844-01-20
Improvement in reverberatory furnaces for smelting or puddling iron
US987793A
(en )
1911-03-28
Crucible-furnace or the like.