Patents Assigned to Dorr-Oliver
  • Continuously operating sedimentation tank with pier supported rake structure
    Patent number: 3959151
    Abstract: Continuously operating sedimentation tank with center pier supported rake structure rotated by a drive head featuring an improved hydrostatic bearing, of compact construction wherein the bull gear is shaped to conform to an improved arrangement of vertical load supporting hydrostatic bearing faces, and radial hydrostatic bearing faces, wherein the base structure of the drive head is a unitary casting embodying an annular reservoir for collecting the hydrostatically spent operating oil, together with improved torque transmitting and weight supporting connecting means between the bull gear and the surrounding top end portion of the vertical cage portion of the rake structure.
    Type: Grant
    Filed: February 7, 1975
    Date of Patent: May 25, 1976
    Assignee: Dorr-Oliver Incorporated
    Inventor: Bernard Liebowitz
  • Sealing means for divider strips on filter drums
    Patent number: 3954622
    Abstract: Filter drum for continuous drum filter featuring longitudinal divider strips or channel members spot welded to the drum cylinder, with caulking material provided underneath the channel member along the length thereof, against leakage between mutually adjoining filtrate chambers.
    Type: Grant
    Filed: September 23, 1974
    Date of Patent: May 4, 1976
    Assignee: Dorr-Oliver Incorporated
    Inventor: Ernest Ryszard Kus
  • Electro ultrafiltration process and apparatus
    Patent number: 3945900
    Abstract: An electro-ultrafiltration process is conducted in a tank in which the cathode and anode regions are separated by an anisotropic ultrafiltration membrane. A pressure differential is applied across the membrane and the fluid component of the bath moves through the membrane under the influence of this pressure for removal from the tank. Current applied between the electrodes develops an additional flow of the fluid component of the bath through the membrane. Due to the special characteristics of the anisotropic membrane, the total flux through the membrane under these conditions greatly exceeds the flux attributable to the individual effects of pressure and current. This process is especially useful when applied in electrophoretic coating systems, for it can establish a stable bath composition and it also tends to maintain the membrane in an essentially unfouled condition.
    Type: Grant
    Filed: September 23, 1974
    Date of Patent: March 23, 1976
    Assignee: Dorr-Oliver Incorporated
    Inventor: Peter R. Klinkowski
  • Pulse transfer thickening
    Patent number: 3930999
    Abstract: Sewage sludge of a uniformly high solids content is pumped from a primary settling tank to a digester or thickener by an air operated spring assisted diaphragm pump.
    Type: Grant
    Filed: December 12, 1973
    Date of Patent: January 6, 1976
    Assignee: Dorr-Oliver Incorporated
    Inventor: John B. Rosenquest, Jr.