Patents by Inventor Sheldon Lefkowitz

Sheldon Lefkowitz has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20160372225
    Abstract: A container is provided for collecting and filtering material. The container includes an inlet penetration through at least one surface of the container, and an outlet penetration through at least one surface of the container. The container further includes at least one filter being integral to the container such that the at least one filter is disposed of together with the container. The at least one filter is connected to the outlet. The material enters the container through the inlet, the material conveyed by a media (filtrate) is passed through the at least one filter resulting in a clean media stream (permeate), and the clean media exits the container through the outlet.
    Type: Application
    Filed: May 15, 2013
    Publication date: December 22, 2016
    Applicant: Pentek, Inc.
    Inventors: Sheldon Lefkowitz, Anton Galkin
  • Patent number: 5440476
    Abstract: A system for positioning a work point in three dimensional space has at least three reeving systems spaced apart from one another, with each reeving system having a adjustable support element connected to it. These support elements are also connected to the work point, with the length of the support elements between the work point and the reeving determining the work point's location. Associated with each reeving system is an actuator adapted for releasing and taking up the support element. A control system controls the actuators to release and take up each of the support elements to move the work point with respective to at least three spatial coordinate axes while controlling at least one motion parameter of the work point in a predetermined manner.
    Type: Grant
    Filed: March 15, 1993
    Date of Patent: August 8, 1995
    Assignee: Pentek, Inc.
    Inventors: Sheldon Lefkowitz, Donald M. Youngwirth, Gerald E. Gore, Harry T. Roman
  • Patent number: 5408407
    Abstract: A system for positioning a work point has a plurality of reeving systems spaced apart from one another, with each reeving system having a adjustable support element connected to it. These support elements are also connected to the work point, with the length of the support elements between the work point and the reeving determining the work point's location. Associated with each reeving system is an actuator adapted for releasing and taking up the support element. A control system controls the actuators to release and take up each of the support elements to move the work point with respective to at least two spatial coordinate axes while controlling at least one motion parameter of the work point in a predetermined manner.
    Type: Grant
    Filed: March 15, 1993
    Date of Patent: April 18, 1995
    Assignee: Pentek, Inc.
    Inventors: Sheldon Lefkowitz, Donald M. Youngwirth, Gerald E. Gore, Harry T. Roman
  • Patent number: 5037159
    Abstract: A method and apparatus is described for vacuum collecting and packaging of particulate materials, such as hazardous radiation contaminated concrete dust generated by floor scabbling, which avoids release of even small quantities of the material into the surrounding air. Each drum is positioned with its open mouth rim closely adjacent to the downwardly facing material-outlet of the vacuum collecting system. In one of the embodiments, an inflatable sealing gasket seals the spacing therebetween during filling. In another embodiment, the vacuum collecting system is vertically movable, and the vacuum collecting head, with a non-inflatable gasket is moved into engagement with the drum to provide the seal during filling. When filled, deflation of the gasket or vertical movement of the vacuum head again provides the narrow spacing, and both the container lid and a cover for the material outlet are passed therethrough.
    Type: Grant
    Filed: April 4, 1990
    Date of Patent: August 6, 1991
    Inventors: Victor H. Nutter, Howard G. Baker, Sheldon Lefkowitz
  • Patent number: 4969311
    Abstract: A method and apparatus is described for vacuum collecting and packaging of particulate materials, such as hazardous radiation contaminated concrete dust generated by floor scabbling, which avoids release of even small quantities of the material into the surrounding air. Each drum is positioned with its open mouth rim closely adjacent to the downwardly facing material-outlet of the vacuum collecting system. In one of the embodiments, an inflatable sealing gasket seals the spacing therebetween during filling. In another embodiment, the vacuum collecting system is vertically movable, and the vacuum collecting head, with a non-inflatable gasket is moved into engagement with the drum to provide the seal during filling. When filled, deflation of the gasket or vertical movement of the vacuum head again provides the narrow spacing, and both the container lid and a cover for the material outlet are passed therethrough.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: November 13, 1990
    Inventors: Victor H. Nutter, Howard G. Baker, Sheldon Lefkowitz
  • Patent number: 4940289
    Abstract: A manually steerable machine for scabbling areas which are relatively inaccessible to larger machines is disclosed. Three pneumatically operable piston and cylinder assemblies with bits are mounted on a plate which is mounted in vertically movable relationship on a frame, the assemblies being disposed at the apices of a triangle, one of the apices being at the forward end of the frame and the other apices being rearwardly of the one of the apices. A tiltable handle extends from the rear end of the frame and upwardly from the frame and includes an air manifold and an air valve for supplying compressed air to the assemblies through hoses. A pair of wheels at the rear of the frame support the frame when the pistons are not operating. A skid plate is attached to the bottom of the frame, and the bits are encircled by a flexible skirt extending downwardly from the frame. A vacuum hose connector has its lower end at the bottom of the frame and between the bits to collect dust.
    Type: Grant
    Filed: June 1, 1988
    Date of Patent: July 10, 1990
    Inventors: Stephen A. Trovato, Sheldon Lefkowitz, Robert J. Eckert