The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
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| Number | Title | Issue Date |
| 6980914 | Method for determining a corrected weight of a batch tank The present invention relates generally to weight measurement methods and systems, and more specifically, to weight measurement methods and systems for material in a dynamic vacuum material transfer or other system utilizing differential conveying fluid pressure. Th... | 12/27/2005 |
| 6439821 | Hopper feed regulating apparatus A hopper feed regulator is provided for controlling the supply of feed to a hopper efficiently without having to directly contact the feed. The assembly includes a chamber having a switch contact, lever, upper hanger, cam follower and spring biasing arran... | 08/27/2002 |
| 6238176 | Method of loading recyclable containers into trailers A method for automatically loading bags of recyclable containers into a trailer. The containers of plastic bags are put onto a conveyor, which delivers them to a loader having a ram to push the bags of containers into the trailer automatically. In a prefe... | 05/29/2001 |
| 5865592 | Stone metering system for railroad track maintenance vehicle A stone metering system for a railroad track maintenance vehicle providing improved accuracy in stone delivery. The system includes a surge hopper, a number of metering augers, and a corresponding number of splitters. The metering augers convey ballast st... | 02/02/1999 |
| 5584641 | Stone metering system for railroad track maintenance vehicle A stone metering system for a railroad track maintenance vehicle providing improved accuracy in stone delivery. The system includes a surge hopper, a number of metering augers, and a corresponding number of splitters. The metering augers convey ballast st... | 12/17/1996 |
| 5417317 | Apparatus for segregating and feeding fruit from a bulk supply Apparatus for segregating and feeding fruit onto a conveyor comprising a conveyor device for moving fruit from a bulk supply, a diverter gate movable from a position to one side of the conveyor device to a fruit intercept position, a holding bin having a ... | 05/23/1995 |
| 5195861 | Automatic rate matching system An automatic rate matching system is provided such that the delivery of bulk material is matched with the quantity of bulk material required by a process. An optical probe is used which determines the depth of material delivered into a hopper, prior to it... | 03/23/1993 |
| 5102281 | Automatic rate matching system An automatic rate matching system is provided such that the delivery of bulk material is matched with the quantity of bulk material required by a process. An optical probe is used which determines the depth of material delivered into a hopper, prior to it... | 04/07/1992 |
| 5004400 | Automatic rate matching system An automatic rate matching system is provided such that the delivery of bulk material is matched with the quantity of bulk material required by a process. An optical probe is used which determines the depth of material delivered into a hopper, prior to it... | 04/02/1991 |
| 4750417 | Method for compacting low density articles In a method of compacting low density articles a conveyor supplies articles to be compacted to a hopper positioned alongside the upper end of a compression chamber in which a platen is adapted to be reciprocated. When the presence of a specified charge in... | 06/14/1988 |
| 4715763 | Dry ash removal system A hopper for use in a dry ash removal system is structured with a front elevational profile which converges from top to bottom while the side elevational profile of same diverges from top to bottom to allow substantially uniform hopper cross-sectional are... | 12/29/1987 |
| 4212889 | Method for processing fish continuously and serially through a plurality of vessels A method of processing fish in which whole fish are reduced to fish solubles in aqueous solution and to fish solids comprising bones and scales. Fish are continuously processed in a series of interconnected vessels so that a continuous steady-state discha... | 07/15/1980 |
| 4170311 | Level measuring system The level measuring system measures a variable level within a sensing area containing a mass of material. A sensing probe is positioned within the area and is coupled to the tank of an oscillating circuit through a switching network. A reference probe pos... | 10/09/1979 |