Patents Examined by Charles N. Hart
  • Patent number: 4521308
    Abstract: Concurrent operation of a sizable number of vacuum filtration units is facilitated by a rotatable carrier stand. Any selected one of the units may readily be turned to a position convenient to the operator without interruption of the vacuum connections and without entanglement of vacuum lines. Components of the filtration units may then be manipulated with a reduced risk of breakage, spillage or inadvertent disconnection of vacuum lines. Installation and removal of a filtration unit may be accomplished very quickly and simply with the use of only one hand in some cases. Simultaneous filtering operations may be performed more efficiently particularly within enclosures such as fume hoods, glove boxes or the like which otherwise restrict access to the filtration units by an operator.
    Type: Grant
    Filed: August 13, 1982
    Date of Patent: June 4, 1985
    Assignee: The Regents of the University of California
    Inventors: George H. Brimhall, Jr., Leonard J. Vigus
  • Patent number: 4497642
    Abstract: A plurality of individual filters extend in line across a duct for a gas flow and the duct can be located within secondary containment. The pressure of gas within the duct is less than external pressure and the filters can be supported by a guideway which extends across the duct between opposing walls of the secondary containment with the interior of the guideway communicating with the secondary containment to provide an inward flow purge. The filters in the line are replaced individually by inserting a replacement filter into the line at one end and retrieving the displaced filter at the opposite end of the line.
    Type: Grant
    Filed: June 24, 1983
    Date of Patent: February 5, 1985
    Assignee: United Kingdom Atomic Energy Authority
    Inventor: Stanley Hackney
  • Patent number: 4473470
    Abstract: A self-cleaning strainer for use in fluid distribution systems including an open ended tubular body having an inlet at one end and an outlet at the other. In use, the strainer body is placed with its axis extending in the direction of fluid flow and with the inlet upstream. The inlet is substantially larger than the outlet and the side wall of the body slopes inwardly away from the inlet so that the cross sectional size of the interior of the body progressively decreases towards the outlet. The side wall is composed at least in part of a plurality of laterally spaced and substantially parallel bars which extend generally in the axial direction of the body. The space between each two adjacent bars constitutes a fluid escape passage and the outlet of the body provides a discharge outlet for particles unable to pass through the passages. The fluid escape passages are elongate in the axial direction of the body and consequently fluid can pass through the side wall without substantial change in flow direction.
    Type: Grant
    Filed: June 11, 1982
    Date of Patent: September 25, 1984
    Assignee: Boving & Co. (Anz.) Pty. Ltd.
    Inventor: John M. Loutit
  • Patent number: 4472184
    Abstract: A support and holding frame for supporting an air filtering element of the type that is of the nonself-supporting type. The invention comprises a frame adapted to hold the filtering element and consists of a three-sided sheet metal box having its upper and lower surfaces provided with bent edges directed toward the inside of the box to serve as flange supports for the filtering element. A pivotal door is provided on one side to permit simple access for insertion and removal of the filtering element.
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: September 18, 1984
    Assignee: Delbag-Luftfilter GmbH
    Inventors: Gerhard M. Neumann, Jochen Karelin
  • Patent number: 4461711
    Abstract: A process for separating and collecting iodine from a liquid phase comprising adding an acid is to the liquid phase, and then conducting the liquid phase through an activated carbon filter.
    Type: Grant
    Filed: March 4, 1982
    Date of Patent: July 24, 1984
    Assignee: Gesellschaft fur Strahlen- und Umweltforschung mbH
    Inventor: Horst Behrens
  • Patent number: 4452707
    Abstract: In the extraction of coal the liquid coal extract is filtered using a filter aid produced by washing the filter cake with a low viscosity, high boiling point, low vapor pressure ester and then calcining the cake to remove the wash solvent and other combustible constituents from the cake.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: June 5, 1984
    Assignee: Industrial Filter & Pump Manufacturing Co.
    Inventors: James F. Zievers, Paul Eggerstedt
  • Patent number: 4451962
    Abstract: A filter block for filtering melt synthetic plastic materials in a process of manufacturing plastics filaments includes a plurality of layers of wire fabric arranged in superimposed relationship. From the top to the bottom the filter block comprises inlet layers, intermediate layers and outlet layers. All the layers of the intermediate portion of the filter block are of identical mesh size which is smaller than mesh size of the inlet and outlet layers. The filter block is produced by cold forming exclusively in a stamp provided with an elastic suport for a pressure plate on which filter layers to be compressed are positioned and with a rigid support, which elastic support and rigid support operate successively to obtain inlet, intermediate and outlet filter layers of differing porosity.
    Type: Grant
    Filed: March 22, 1982
    Date of Patent: June 5, 1984
    Assignee: Haver & Boecker
    Inventors: Jurgen Cornelsen, Werner Schneider
  • Patent number: 4451368
    Abstract: An annular drip collector is shaped and dimensioned to slidably sleeve onto the cylindrical wall of an oil filled filter cartridge, in need of replacement, while the cartridge is projecting from an engine and attached by its threaded open end. The large diameter wall of the collector forms a truncated conical trough with the adjacent cylindrical portion of the cartridge wall proximate its open end to collect oil spillage. The integral, smaller diameter cylindrical wall, or skirt, of the collector toward the closed end of the cartridge is substantially equal in inside diameter to the outside diameter of the cartridge. At least one integral, inward projecting, annular rib, tooth or flange in the lower cylindrical wall, seals the collector against the cartridge by reason of the flexible, resilient, polyethylene plastic of the collector. The outwardly flared, truncated conical, collector will nest with other collectors for shipment.
    Type: Grant
    Filed: September 30, 1983
    Date of Patent: May 29, 1984
    Inventors: Michael N. Pandelena, Peter Strozza
  • Patent number: 4451372
    Abstract: The specification discloses a method and installation for purifying waste. A tank (1) is fed with the waste and with a biological filter substrate, both of which are fermented within the tank. Pipes and ducts (17, 28) supply air to an upper aerobic fermentation region and to a lower aerobic fermentation region, and ducts (22) remove gaseous and liquid products from a middle anaerobic fermentation region.The fermentation products are removed by a sweeping worm (29) and sucked by a fan (43) through a separator (33) in which heavy particles fall out (through 40) but lighter ones are retained by the suction. The product is triturated (44) and may be dried (45, 46) and made into briquettes (51) for use as fuel.
    Type: Grant
    Filed: September 23, 1981
    Date of Patent: May 29, 1984
    Assignee: D. Felipe Pineda S.A.
    Inventor: Felipe P. Rovira
  • Patent number: 4450080
    Abstract: An apparatus for removing excess liquid and contaminants from a belt filter cake includes a perforated main belt extending over a separation drum. An anti-wear permeable belt has one portion lying against part of the main belt supported by the separation drum. There are exterior suction headers and chambers effective through the anti-wear belt and main belt and a main suction box within the separation drum for cake recovery where the main belt is in contact therewith. Wash water nozzles are within the separation drum directed toward the exterior suction headers and chambers.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: May 22, 1984
    Inventor: Joseph C. Dodd
  • Patent number: 4448686
    Abstract: A filter bag is provided with an integral flap for agitating a liquid which is being filtered to thereby inhibit particulate matter from collecting on the filter bag and clogging it during a filtering operation.
    Type: Grant
    Filed: November 4, 1982
    Date of Patent: May 15, 1984
    Assignee: Oil Process Systems, Inc.
    Inventor: Bernard Friedman
  • Patent number: 4448690
    Abstract: A system for utilizing and disposing of sludge and other wastes employs an artificially created perched bed and a subsurface injector system that applies such wastes in a liquid or semi-liquid state to an aerobic portion of the bed. The solids from the waste mixture are suspended in the bed while the liquids percolate through the bed to an underdrain system for collection, monitoring, further treatment, ultimate reuse, or direct discharge. The system provides closed loop disposal of the waste stream in a completely controlled environment without impact to the local environmental system. The bed's selected media can be changed into a beneficial by-product--top soil--through the addition of the waste material. Subsurface injection may be accomplished by moving an injector sweep either by a vehicle supported on the artificial bed or by a movable superstructure. Repeated applications of sludge or waste may be made to the bed without plugging due to the disruptive action of the injector sweep on the bed material.
    Type: Grant
    Filed: September 14, 1981
    Date of Patent: May 15, 1984
    Assignee: Genstar Waste Transfer, Inc.
    Inventor: Sam W. Maphis
  • Patent number: 4447655
    Abstract: An efficient method of purifying bisphenol-A is presented whereby solvent washing of the bisphenol-A crystals and extraction of impurities, bisphenol-A and phenol from the aqueous liquid of a water/bisphenol-A crystal slurry is accomplished simultaneously and in a continuous operation. The method involves contacting the water/bisphenol-A crystals with an organic washing solvent in a continuous, multi-stage, countercurrent extraction column.
    Type: Grant
    Filed: November 24, 1982
    Date of Patent: May 8, 1984
    Assignee: General Electric Company
    Inventor: Ashok K. Mendiratta
  • Patent number: 4447324
    Abstract: A water screen comprises a revolving screen member, e.g., a band screen or a drum screen, and a washing device. The washing device, comprises a sprayer on one side of the downstream run of the screen member and a recovery channel on the opposite side of the downstream run of the screen member. On the same side as the recovery channel and between it and the sprayer is a mobile trough member. The trough transversely and obliquely from its leading edge adjacent the recovery channel, e.g. a band screen or a drum screen. The leading edge of the trough is maintained continuously in contact with the screen member which may be exclusively by the effect of gravitational force on the trough member.
    Type: Grant
    Filed: April 8, 1982
    Date of Patent: May 8, 1984
    Inventor: Philip Jackson
  • Patent number: 4444661
    Abstract: A disposable filter device having a plastic housing with inlet and outlet chambers separated by a filter disc sealed within the housing, the housing being readily disassemblable after use to remove the filter disc for identification or analysis of the material filtered from the fluid.
    Type: Grant
    Filed: April 16, 1982
    Date of Patent: April 24, 1984
    Assignee: Gelman Sciences Inc.
    Inventors: Mark E. Jackson, Monty E. Vincent, Attila Vadnay
  • Patent number: 4443335
    Abstract: An aeration device for introducing air into a pool of water. The device basically comprises a cylindrically shaped main body portion and a retaining ring for pivotally securing a generally spherically shaped water direction spout within a portion of the main body. The main body has a hollow interior. One end of the main body terminates in a threaded portion adapted to be received in a conventional water supply port found in the wall of the pool. A tube has one end in fluid communication with the spout and the other end exposed to ambient air. As water passes from the water supply port through the water direction spout, a suction is created, drawing air through the tube and into the flow stream of the water for introduction into the pool.
    Type: Grant
    Filed: June 18, 1982
    Date of Patent: April 17, 1984
    Inventor: Michael Gullace
  • Patent number: 4443346
    Abstract: In a method of cleaning filter elements a removal of filter cakes formed on the filter cloth of the filter elements is accomplished by the application pressure and vacuum in the alternating fashion to the filter elements after the filtration process has been completed. The cleaning effect is improved due to the pressure fluctuations because the filter cloth expands upon those fluctuations and filter cake formed thereon is peeled off that filter cloth.
    Type: Grant
    Filed: August 30, 1982
    Date of Patent: April 17, 1984
    Assignee: Dr. Ing Hans Mueller, AG
    Inventor: Hans Muller
  • Patent number: 4443336
    Abstract: A water purifying system unit that is portable, fabricated of durable parts and makes provision for storage of basic survival needs in addition to water. A double chamber unit with bag and filter with separating filter and storage compartment provides three stage filtration of water. An appropriate mouthpiece makes drinking directly from the unit possible.
    Type: Grant
    Filed: October 4, 1982
    Date of Patent: April 17, 1984
    Inventor: Mary L. Bennethum
  • Patent number: 4441996
    Abstract: An apparatus for producing drinking water from bacteria contaminated cold water is provided. The cold contaminated water is placed into a flexible collector having a sub-micron porous filter in the bottom. When the flexible collector is squeezed, the pressure forces the contaminated water through the filter and into a holding chamber. The drinkable filtered water is removed from the holding chamber through a sterile exit opening.
    Type: Grant
    Filed: March 31, 1982
    Date of Patent: April 10, 1984
    Inventor: Richard F. Hurst
  • Patent number: 4442001
    Abstract: A rotary filter drum in which the drum is a single cell having a perforated cylindrical wall and solid end walls. A hollow central shaft extends through the drum and its opposite ends extend axially from the end walls. The drum contains a plurality of relatively narrow elongated open-top pans that are equally spaced radially from and angularly about the central shaft. Each pan is defined by a bottom, spaced apart inner and outer sidewalls which extend the full length of the drum and the drum end walls. The pan walls are secured to the ends of the drum. The pans are located so the open tops face the direction of drum rotation and the entire leading edge of the outer sidewall of the pan is secured to the perforated cylindrical wall. A closed conduit connects the bottom portion of each pan to the central shaft which in turn connects to the vacuum source so the filtrate is removed from and vacuum applied to the interior of the drum solely through the central shaft but via the pans and connecting conduits.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: April 10, 1984
    Assignee: WesTech Engineering, Inc.
    Inventor: Kent L. Davis