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...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.

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Assignee: Crown Iron Works Company


Location: Minneapolis, MN
No. of patents: 14

NumberTitleIssue Date
7234512Heat exchanger with internal baffle and an external bypass for the baffle
A shell and tube heat exchanger has at least one baffle to support the tubes within the casing of the heat exchanger, wherein the baffle intersects the inner casing wall along a substantial portion of the arc. The baffle has a bypass through which flows at least a p...
06/26/2007
6766595Apparatus and method for enhanced solvent recovery from solvent extracted material
Apparatus and method for desolventizing particulate material having a solvent carried thereby wherein an upper indirect heating zone and a lower direct heating zone is provided. Each of the zones has a plurality of spaced apart horizontal trays for receiving particu...
07/27/2004
6279250Apparatus for enhanced solvent recovery from solvent extracted material
Apparatus and method for desolventizing particulate material having a solvent carried thereby wherein an upper indirect heating zone and a lower direct heating zone is provided. Each of the zones has a plurality of spaced apart horizontal trays for receiv...
08/28/2001
6262285Process for dry synthesis and continuous separation of a fatty acid methyl ester reaction product
A continuous separation of fatty acid methyl esters (FAME) from glycerol in a low pressure dry transesterification process for vegetable oil is provided. Improved purity of the FAME and the glycerol fractions are achieved via the use of continuous decanta...
07/17/2001
5884769Particulate material processing tray
A tray for supporting particulate material in an apparatus for processing. The tray includes an upper plate which has pluralities of associated groupings of first apertures formed therein. The tray also includes a lower plate which has a plurality of seco...
03/23/1999
5770082Self-purging extractor
An improved longitudinal extractor utilizing a solvent for removing an entrained liquid from a carrier medium. The improved extractor includes a sprocket driven continuous chain-link conveyor mounted both in cooperation with an upper carrier medium chambe...
06/23/1998
5727689Treatment device for particulate materials
A device for conditioning particulate matter such as particalized soybean meats and hulls. The device includes a chamber. The chamber includes a lower increased velocity stage in which gas movement is accelerated because of constriction resulting from the...
03/17/1998
5294002Air separator with spiral staves
Apparatus (10) for separating intermixed particulate materials. The apparatus (10) includes a housing (12) having a coaxial core (14) disposed therewithin to define an annular space (24) between the core (14) and the wall of the housing (12). A recirculat...
03/15/1994
5181817Fastener
A fastener for securing an attachment such as a guiderail to a surface of a wall. Such an attachment is provided with an internally-threaded aperture to receive the externally-threaded shank of a bolt passed through an aperture in the wall to which the at...
01/26/1993
5024148Coating removal device for granular materials
A device for removing coatings from granular materials such as hull-encased meats of grains. The device includes a housing within which is journaled a rotatably disposed drum. A wall is also mounted within the housing, the wall angling downwardly and bein...
06/18/1991
4869910Method of conditioning oil seeds and similar materials
A method of conditioning an oil seed for removal of the hull therefrom for subsequent processing of the meat portion of the oil seed. The method includes a step of passing the oil seed, under the influence of gravity, downwardly through a plenum (26) of a...
09/26/1989
4865633Separator
A baffle (34) configurable in a cyclone separator (10) in order to improve the flow capacity, efficiency, and effectiveness of the separator (10). The baffle (34) is disposed for vertical insertion through an upper wall (18) of the separation chamber (12)...
09/12/1989
4751060Extractor
The present invention is an improved extractor (10) for removing a liquid from a solid carrier medium in which the liquid is entrained. The extraction process is accomplished by utilizing both percolation and immersion removal methods. The extractor (10) ...
06/14/1988
4635380Method and apparatus for heat treating flowable materials
A continuous process for heat treating flowable materials having liquids thereon and apparatus wherein a first portion of adhering liquid is vaporized in a pre-desolventizer (PDS) consisting of at least one horizontal steam jacketed conveyor tube (60-63),...
01/13/1987
 
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