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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7334710 | Closure assemblies for stores of flowable material The closure assembly comprises a first closure device in the form of a cone valve typically having a downwardly diverging upper surface and a second closure device in the form of a plug which is vertically slidable relative to the first closure device so that when i... | 02/26/2008 |
| 5385437 | Device for charging a pressurized enclosure A device is provided for charging a pressurized enclosure, particularly a blast furnace. The device comprises a closing off bell which is movable inside a hopper and is used to close off a discharge opening. A lower sealing member encompasses a closing of... | 01/31/1995 |
| 4881869 | Furnace charging throat construction In a throat stopper for shaft furnaces, in particular blast furnaces with two hoppers of which an upper hopper is rotatable through a drive device, the upper hopper is designed, by a stationary hood equipped with charging flap valves, as a sluice chamber ... | 11/21/1989 |
| 4747741 | Device for closing the charging opening for pressure resistant containers The device for closing the charging opening of an autoclave (1) has a cover (2) which can be lowered into the interior of the autoclave by means of a drive means supported at the outer side of the autoclave (1). The charging opening overlaps with its annu... | 05/31/1988 |
| 4512702 | Installation for feeding a shaft furnace A feeding mechanism for a shaft furnace is presented wherein the feeding mechanism is mounted axially on the furnace and employs a vertically adjustable frustoconical dosing element for vertical flow of charging material to a distributing spout.... | 04/23/1985 |
| 4216946 | Gate arrangement for counterpressure blast furnaces A gate arrangement, especially for counterpressure blast furnaces, including a seal lid having an annular soft seal-insert and a steel seal-ring arranged at the lower end of the gate, which corresponds to the soft seal-insert. The arrangement also include... | 08/12/1980 |
| 4116345 | Charging apparatus for shaft furnaces and method Apparatus for charging material into a shaft furnace, such as a blast furnace. The apparatus includes gas lock means for introducing charge material into the furnace while the furnace is under gas pressure, and distributor means below the gas lock means t... | 09/26/1978 |
| 4071166 | Blast furnace charging method and apparatus A method for the controlled delivery of ore charges to a shaft furnace is disclosed. The method employs apparatus including a plurality of sensors on which an intermediate charge storage hopper is supported whereby continuous measurement of charge weight ... | 01/31/1978 |
| 4071151 | Vibratory high pressure coal feeder having a helical ramp Apparatus and method for feeding powdered coal from a helical ramp into a high pressure, heated, reactor tube containing hydrogen for hydrogenating the coal and/or for producing useful products from coal. To this end, the helical ramp is vibrated to feed ... | 01/31/1978 |
| 4026427 | Charging apparatus for receptacles Apparatus for charging material into a shaft furnace, such as a blast furnace. The apparatus includes gas lock means for introducing charge material into the furnace while the furnace is under gas pressure, and distributor means below the gas lock means t... | 05/31/1977 |
