William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 8113386 | Device and method for on-demand dispensing of spoonable or drinkable food products having visual appearance of multi-components A dispensing system and method for the on-demand dispensing of spoonable or drinkable food products into a container. Single servings or larger portions of these products can be dispensed. The system and method achieve dispensing of the product with a visual differe... | 02/14/2012 |
| 7185596 | Seed slide for use in an agricultural seeding machine A seeding machine includes at least one seed metering system and at least one seed placement system. Each seed placement system is in communication with a corresponding seed metering system. Each seed placement system includes a seed slide having a bottom end and a ... | 03/06/2007 |
| 7131495 | Method for preparing a chlorine dioxide block-removing agent in oil wells A method to synthesize a chlorine dioxide block remover in a well is described. The method includes dissolving a chlorate aqueous solution and some acidic substances in water and to produce a hydrogen ion. The chlorate aqueous solution and acidic substances are quic... | 11/07/2006 |
| 6921001 | Hydraulic proportioning system An hydraulic proportioning system having a fluid actuated motor with a driven motor shaft, the motor being in fluid communication with and powered by a fluid source. A pump is provided having a drive shaft driven by the driven motor shaft of the fluid actuated motor... | 07/26/2005 |
| 6223949 | Spinning valve The present invention includes a spinning valve having an inner valve portion and an outer valve portion, and having multiple inlets and multiple chambers at different heights along the longitudinal axis of the inner valve portion. The present invention a... | 05/01/2001 |
| 6029853 | Dispersing method, dispersing apparatus and dispersing system having dispersing apparatus A dispersing system comprises a dispersing apparatus, a storage tank for storing a dispersing medium and a liquid containing a material to be treated, and conduits for connecting the dispersing apparatus in fluid communication with the storage tank. The d... | 02/29/2000 |
| 5314090 | Material feeder An improved powder feeder having a hopper with an opening in its bottom. A resiliently deformable element is positioned in the opening of the hopper. The element has a flexible exterior dimension and is suitably positioned in relation to the opening to pr... | 05/24/1994 |
| 4810097 | Dispensing apparatus A dispensing apparatus is located in the rear of a tip truck body. When the tipping body of the truck is inclined gravity causes bulk material held in the tipping body at either side of a partition to feed augers. The dispensing apparatus includes at leas... | 03/07/1989 |
| 4759633 | Apparatus and process for metering and mixing two different materials that are pasty or of low to high viscosity An apparatus for metering and mixing two different materials that are pasty or of low to high viscosity, includes a device for simultaneously delivering the materials from storage vessels to a mixing chamber, and a member for mixing the two materials in t... | 07/26/1988 |
| 4757918 | Spreading apparatus The spreading apparatus has a main hopper and at least one extension hopper, each having a discharge roller for flowable material such as chippings for road surfacing. The extension hopper is mounted adjacent the main hopper and movable longitudinally to ... | 07/19/1988 |
| 4444337 | Apparatus for proportioning fluids An apparatus and method for determining the heating value of gaseous fuels is disclosed which include the novel means for establishing a mixture of air and the gaseous fuel of interest in known volumetric proportions. An electrochemical sensor is provided... | 04/24/1984 |
| 4121738 | Apparatus for the continuous feeding of plural liquids in separate streams of adjustable quantity and ratio Apparatus for the continuous feeding of plural liquids in separate streams of adjustable quantity and ratio, comprises a drive unit that drives a main pump, and that also drives at least one secondary pump. The drive unit has an oscillating or reciprocati... | 10/24/1978 |
| 4113148 | Disperser head for seed and fertilizer drill machines A disperser head for seed and fertilizer drill machines comprises a disperser element which is drivable about a vertical axis and opens into discharge sockets. The disperser element consists of a short pipe member which is chargeable from the top and is b... | 09/12/1978 |
| 4033482 | Conical liquid metering device A device for precisely metering out quantities of fluids is disclosed. The device comprises a tapered rotor having a plurality of chambers, each of the chambers having first and second openings. The rotor is received within a housing and together with the... | 07/05/1977 |
| 3993219 | Metering and mixing apparatus for a plurality of liquids An apparatus is provided for mixing metered quantities of a plurality of liquids in accurately constant proportions according to a continuous process. The apparatus comprises one storage tank for each of the liquids which must be mixed, each storage tank ... | 11/23/1976 |