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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 4123356 | Filter cleaning method and filter system A cleaning method of an etched disc filter and the system therefor, in which a plurality of discs having grooved surfaces are assembled or piled one on top of another. This filter is used for removing cruds and the like in a nuclear plant. For separating ... | 10/31/1978 |
| 4116838 | Sludge filter A sludge filter is disclosed of the type having an open-topped tank adapted to receive a quantity of sludge, and one or more filter panels vertically disposed within the tank. A hose connection extends between each panel interior and the tank exterior to ... | 09/26/1978 |
| 4111806 | Gravitational separator for mixtures of immiscible liquids of different densities An improved gravitational separator for mixtures of immiscible liquids of different densities, particularly oil and water, includes a reaction member in the form of a dome or diaphragm immersed in more dense liquid to be separated and which floats upwardl... | 09/05/1978 |
| 4092248 | Pump-filter assembly A pump-filter assembly for a recirculating toilet comprising, an axial flow pump including a support tube and a drive shaft supported therein, means for rotating the drive shaft in first and second opposite directions, a first impeller secured to the driv... | 05/30/1978 |
| 4090962 | Reverse flushing filter device A reverse flushing device has a housing with an inlet, an outlet and a first filter to receive the flow therebetween with means in the housing to divert flow through the first filter. A second filter, positioned upstream of the first filter, has an intern... | 05/23/1978 |
| 4088579 | Process and equipment for the thickening of slurries Slurry to be densified by removal of water is passed into an inlet of a housing, through the housing, and out an outlet. Inside the housing are a plurality of elongated hollow filter elements, which extend in the direction of flow of the slurry. Water in ... | 05/09/1978 |
| 4085051 | Self-cleaning filter for cleaning liquids from suspended matter A self-cleaning filter for cleaning liquids from suspended matter comprises a container with filtering partitions which divide said container into parallel sections for the contaminated liquid and into a cleaned-liquid section located between the first tw... | 04/18/1978 |
| 4057501 | Filter apparatus and filter element therefor A filter element for a filter apparatus comprises a rigid support plate on at least one side of which is spanned a generally square filter cloth. This filter cloth may be formed as a pair of panels joined permanently together on three sides so as to form ... | 11/08/1977 |
| 4051033 | Filter device A diatomite filter device for cleansing fluid carrying particulate matter in the micron size range comprises a filter housing having top and bottom plates and a manifold beneath the latter. A supply conduit communicates with the manifold and with a valve-... | 09/27/1977 |
| 4032443 | Removal of grease and oil from particulate bed granules by backwashing with a detergent Filtering solids from waste water liquids and cleaning, degreasing and restoring the filtering media through the use of cleaning compounds forced up through the filtering substances.... | 06/28/1977 |
| 4032442 | By-pass and synchronized blow system and method for rotary vacuum filters A method and system for use with rotary vacuum filters having a plurality of circumferentially spaced filter segments, for selectively applying blower air to the filter segments at predetermined rotational positions at which relatively unrestricted openin... | 06/28/1977 |
| 4002567 | Ultrafiltration apparatus An ultrafiltration apparatus comprising a module in which a number of hollow fibers having semipermeable walls, disposed in approximately parallel and collected orderly to form a bundle and fixed with a cast-molding material at at least one end portion th... | 01/11/1977 |
| 3998735 | Apparatus and method for separating a mother liquor into a concentrated particulate fraction and a filtrate fraction An apparatus provides for continuous filtration of a mother liquor and continuous removal of solids from the filter element so that the apparatus need not be shut down for cleaning or replacement of the filter element. The solids are separated from the mo... | 12/21/1976 |
| 3977975 | Apparatuses for the separation of mixtures of liquids of different gravities, e.g. oil and water Apparatus to separate a mixture of liquids of different specific gravities, e.g. oil and water, said apparatus having in a closed vessel a separation space with means for controlling the discharge of lighter liquid therefrom and a multiple filter provided... | 08/31/1976 |
| 3976577 | Filter unit with protected valve controllers Filter assembly, particularly for handling liquids at elevated temperatures. There is disclosed a filter assembly wherein the headers supplying filter liquid to the filter units and receiving filtrate therefrom are arranged in a first zone, all the filter... | 08/24/1976 |
| 3969248 | Pool filtering system A pool filtering system is shown. Dirty water from the pool passes into a stilling or surge chamber under the control of a float valve, then passes through a large particle interceptor screen into a filter element chamber which has a plurality of generall... | 07/13/1976 |
| 3966611 | Filter In filters of the type in which a cake of solids deposited from a liquid slurry thereof on a generally horizontal filter medium is subjected to treatment involving passage of liquid through the cake while on the filter medium, means is provided for increa... | 06/29/1976 |
| 3954621 | Filtration system having prefilter and main filter A filtration system comprises a relatively thin prefilter medium and a relatively thick main filter medium, which are so related that the pore size of the prefilter medium is no greater than the pore size of the main filter medium. The purpose of the pref... | 05/04/1976 |
| 3944488 | Self-cleaning filter with motor incorporated therewith This invention relates to a self-cleaning filter formed of an assembly of filtering elements fed in parallel, a rotary distributor enabling the feed of a series of filtration chambers to be cut off, wherein the distributor is driven by a hydraulic motor f... | 03/16/1976 |
| 3935105 | Tubular filter in settler A separator for solid particles from a liquid, such as a dirty industrial machine tool coolant, comprising a settling tank with one or more frames or assemblies of horizontally extending tubular filters and means to removably clamp such frames against a s... | 01/27/1976 |
