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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 6099229 | Coal charging car for charging chambers in a coke-oven battery A coal charging car for a coke-oven battery has a screw-type feeder beneath the coal hopper shiftable on the chassis of the car to allow positioning of the outlet of that feeder over the hole communicating with the coking chamber without moving the car.... | 08/08/2000 |
| 5269233 | Stoker or particulate conveyor A heater for burning particulate combustible fuel material, and a stoker for transferring the fuel for use in connection with such a heater. The heater includes a burner with a step upward from the stoker onto the burner, for reducing the possibility of t... | 12/14/1993 |
| 5052874 | Compacting screw feeder Apparatus for densifying particulate solids and for removing air from the solids includes a screw feeder that conveys the material through a recirculation chamber, then into a high pressure shroud that is closed at its downstream end by a preloaded cover ... | 10/01/1991 |
| 4806056 | Modular fuel metering apparatus and method for use thereof Apparatus and a method for delivering materials such as comminuted rubber tires as a secondary fuel to a combustion chamber of a furnace or kiln. A hopper includes a variable speed electric motor-driven screw conveyor, and a control system provides a vari... | 02/21/1989 |
| 4702177 | Waste product feeder A waste product feeder in which when waste products are charged through a hopper into a trough are transported by a screw and then discharged, they are successively scraped by a scraper in a predetermined quantity or volume.... | 10/27/1987 |
| 3976548 | Apparatus for processing coal and like material Apparatus and methods for processing coal and like material, wherein the material is converted by heat into plastic-like condition and then supplied to a pressurized receiver such as a coal gasification reactor or a synthesis gas generator.... | 08/24/1976 |
