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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7093457 | Annular cooler pallet construction A pallet construction for an annular cooler forms a gas permeable surface for supporting and transporting material during processing thereof. The pallet construction includes a pallet deck having a series of substantially parallel rows of spaced apart elongated slot... | 08/22/2006 |
| 6945388 | Anti-shingling product conveying chain A product conveying chain includes a top plate fixed to a base chain. The base chain is formed from a series of pairs of inner sidebars pivotally connected to adjacent pairs of outer sidebars. The top plate is fixed to the base chain, and has a trailing edge adjacen... | 09/20/2005 |
| 5081938 | Method and apparatus for controlled bidirectional feeding of particulate matter A method and apparatus are provided for effecting bidirectional feeding of particulate material, such as in the bidirectional feeding of fuel to a circulating fluidized bed combustor. A feeder has a housing with at least one inlet in the upper portion of ... | 01/21/1992 |
| 4895081 | Gravimetric feeder, especially adapted for use in a calorimetry system A calorimetry system for measurement of the heating value of coal, having a combustor 24 and a mixing unit 30 wherein heat from combustion gases is transferred to air. The system has a gravimetric feeder 64 for providing coal at a measured mass feed rate;... | 01/23/1990 |
| 4765256 | Reinjection gasifier A gasifier (10) for particulate combustible material in effect separates the pyrolysis and the oxidation of the flowable fuel material with a traveling grate (40) for advancing a bed of the material from a material feed station (40A) to a material dischar... | 08/23/1988 |
| 4621584 | Method and device for firing solid fuels, mainly in the form of lumps or pieces Method and device for firing solid fuels, substantially in the form of lumps or pieces, in a furnace having a combustion chamber (1) with a sustantially horizontal bottom (10), upon which is maintained a fuel bed (3) with relatively great thickness while ... | 11/11/1986 |
| 4487138 | Traveling grate for a furnace A traveling grate for a furnace. The grate is formed of plural pipes through which flows a cooling medium, in particular water. The grate also includes plural movable chains. Grate plate guide flanges are arranged laterally on the pipes. The guide plates,... | 12/11/1984 |
| 4475468 | Incinerator with moving-bed stoker An incinerator with a moving-bed stoker in which a chain conveyor is inclined in the direction of its movement and a plurality of fuel- or fire-bed members L-shaped in cross section are mounted on the links of the chain conveyor, whereby a step-like movin... | 10/09/1984 |
| 4398473 | Stoker backstop A wood-burning stoker grate is provided a barrier across its rear end functioning as an impact surface for fuel and foreign matter projected toward the rear of the stoker grate. The barrier is made up of two sections, each section formed of parts with the... | 08/16/1983 |
| 4353315 | Step grate for mechanical stoker with flexible fire grate A flexible, perforate grate, e.g. made of a mat of meshed metal chain links or wirecloth belting, is provided at intervals spaced across its length, with individually extensile/retractile supports. By coordinately extending and retracting the supports, th... | 10/12/1982 |
| 4091750 | Grate plate arrangement for a travelling grate The invention relates to a grate plate arrangement for a travelling grate in which the grate plates bear with their front highly curved portion on a grate pin and with their rear less curved portion on the following grate plate, a web provided at the lowe... | 05/30/1978 |
| 3962977 | Grate bar casting for incinerator or other conveyor In a grate bar for use in supporting grate keys, a casting of high carbon steel is formed having a web portion and integral upper and lower flanges therewith, and a series of gussets and end plates to provide the structure for strengthening and securement... | 06/15/1976 |
