Class 209/237 - Material testing

Subclass of Class 209 - Classifying, separating, and assorting solids
Definition: Sifting devices employed or adapted for sifting material
No. of patents: 23
Last issue date: 08/16/2005

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Number	Title	Issue Date
6929393	Asphalt production plant An asphalt production plant includes an asphalt binder storage tank, a mixer for mixing asphalt binder and aggregate materials, an asphalt binder pumping system for conveying asphalt binder to the mixer and an asphalt binder metering system for controlling the rate ...	08/16/2005
6546793	Method for manufacturing concrete A method for selecting proportions of aggregate for incorporation into concrete comprises several steps. First, a maximum aggregate size for a specific application is determined. A sample of the maximum size aggregate is loose poured into a container. The...	04/15/2003
6142309	Method of determining the amount of residue in carbon black Test methods are provided for determining the amount of contaminants in a carbon black sample. The test procedures include screening a known amount of carbon black to separate larger particles in the sample from smaller particles. The sample and/or separa...	11/07/2000
5588535	Sample preparation system for separating wear particles by size and magnetic characteristics A system for preparing samples of wear particles employs a series of movable particle traps or screens within a passage to separate particles by size and magnetic characteristics. Movable magnets are placed adjacent to an inlet tube upstream from the part...	12/31/1996
5181616	Grain processor A grain processor for separating and measuring components of a sample of grain as it passes through a rotary sieve having two or more sieving sections having different perforations. The separated particles in each of the sieving sections are passed throug...	01/26/1993
5181618	Apparatus for clearing the weigh pan of a particle size analyzer An apparatus for automatically removing particulate matter from a weighing pan of a particle-size analyzer. The apparatus includes a weighing pan having a hinged door to provide a discharge outlet for the particular matter and a wiper blade assembly for c...	01/26/1993
5108588	Structure of vibro separator A vibro separator, comprising a separator unit which is comprised of a screen assembly releasably mounted on a hopper at the top, which screen assembly has a screen releasably fastened therein; a vibrator unit which is comprised of a motor directly or ind...	04/28/1992
5059310	Analytical sieve apparatus A vertical set of sieves receives the particulate material from a vibrating trough conveyor above the set and is vibrated by an agitator on the machine frame. The sieves are spread apart and then tilted to dump the collected particles into respective funn...	10/22/1991
4935124	Rotatable wood chip classifier A rotatable wood chip thickness classifying device. The apparatus includes two coaxial, spaced sets of apertured discs, each set defining a drum. The interdisc spacing of each drum is uniform, each drum having a different interdisc spacing from the other ...	06/19/1990
4930359	Apparatus for preparing samples from a flow of bulk material An apparatus for preparing samples taken from a flow of bulk material for the purposes of determining representative chemical and/or physical characteristics of the sampled material. The sampled material is removed in the form of a mix of fine and coarser...	06/05/1990
4797204	Automatic particle-size analyzer with divided drum An apparatus for automatic screen analysis of a granular material in which the material is screened from a polygonal drum which is divided crosswise into at least two chambers by a transverse partition. A first chamber has progressively coarser screens on...	01/10/1989
4704911	Apparatus for analysis of particulate material Apparatus for analysis of particulate material employs a stack of spaced sieves permanently joined to form a sieve column. Clean-out ports are provided for inter-sieve spaces. In one embodiment the clean-out ports communicate with a common passage that is...	11/10/1987
4702826	Screen cleaner for particle size analyzer Disclosed is a device for sequentially cleaning the screens of a particle size analyzer of the indexing drum type, as each screen moves out of the screening position. The cleaning member is preferably removed from the drum during each screening step. The ...	10/27/1987
4588091	Method and apparatus to determine quality of particulate material An apparatus for the measurement of the quality parameters of granular materials includes a loader assembly which delivers precise volume samples of granular material to a meter assembly which measures the moisture content. The apparatus also includes a s...	05/13/1986
4519244	Casecadeograph and method of use This invention relates generally to the field of particle chromatography, and more specifically to a method and apparatus employing the cascade principle for the purpose of characterizing particles according to subtle differences between the individual pa...	05/28/1985
4381669	Method and apparatus for determining the number of seeds per unit weight in a seed sample The correct plant population is obtained by utilizing a method and apparatus for determining the number of seeds per unit weight in a sample number of seeds representative of the type of seeds to be planted. A seed sorter comprising a plurality of stacked...	05/03/1983
4337150	Fiber fractionating device A device for fiber fractionation to analyze for coarse particles or chips in which fractionation takes place by washing a sample of the fiber material on a horizontally disposed slotted plate submerged in water, a central bundle-type nozzle which extends ...	06/29/1982
4249655	Cyclone dust analyzer for determining microdust content in fibers An apparatus for removing dust from a fiber sample for subsequent analysis is disclosed. A first upper cylindrical chamber containing a fiber sample has a tangential air jet and a radial air jet installed to swirl and tumble the fiber sample in a cyclonic...	02/10/1981
4233151	Shaker mechanism for a stack of sieve trays A stack of interfitting sieve trays are held in position on a carrier by an upstanding periperial wall on the carrier which engages the lower portion of the lower sieve tray, and by a plurality of clamp-down units which at their lower ends are pivotally c...	11/11/1980
4116824	Automated wet sieving apparatus An automated wet sieving apparatus and process are provided comprising a wetting liquid distributor which is coupled by eccentric disks to a motor which drives the distributor in an orbital path for supplying the liquid onto a sieve. Means are provided fo...	09/26/1978
4032436	Particles sizing Sieve analysis and fineness modulus of particles are adjusted in bulk, without breakdown into size fractions and reblending to tailor a feed product for a given application such as asphalt sand or concrete sand by adjusting the rate of largest size cut an...	06/28/1977
4013550	Manufacture of thermoplastic resin beads In the manufacture of thermoplastic resin particles by polymerization, size classification by screening of polymerized particles at rates from 27 to 69-lbs/hr-ft2 is improved by the use of solid finely divided phosphates and carbonates in amoun...	03/22/1977
3943754	Method and apparatus for determining the relative weight proportions of different size fractions of a sample of particulate material A sample of particulate material is entrained in a moving body of fluid and the fluid is continuously discharged through a porous weighing member. Before passing to the weighing member sized fractions within the sample, except for the smallest one, are se...	03/16/1976

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Class 209/237 - Material testing