Patents Assigned to Washington Suburban Sanitary Commission
  • Patent number: 7396194
    Abstract: A drill press is magnetically mounted on a steel plate which is clamped to a manhole cover by three L-shaped clamps. The L-shaped clamps are mounted in slots defined by brackets located on the periphery of the steel plate. Enlargements are provided on the L-shaped clamps to keep the L-shaped clamps from falling out of the slots.
    Type: Grant
    Filed: February 13, 2006
    Date of Patent: July 8, 2008
    Assignee: Washington Suburban Sanitary Commission
    Inventor: Rutland M. Jones, III
  • Patent number: 6227463
    Abstract: Tap water supply systems are flushed by opening fire hydrants and running potable water through the fire hydrants for a period of time. Since potable water usually contains chlorine, it is necessary to remove the chlorine before the water enters rivers, streams and bays in order to protect aquatic life. This is accomplished by passing the water through a diffuser attached to the fire hydrant, which diffuser contains a mesh bag with a sodium sulfite tablet therein.
    Type: Grant
    Filed: September 22, 1999
    Date of Patent: May 8, 2001
    Assignee: Washington Suburban Sanitary Commission
    Inventor: Michael Porter
  • Patent number: 5540096
    Abstract: A method for detecting degraded pipe used in water mains monitors detected sound waves and observes the characteristics of those waves. Water main pipes have coiled therearound highly tensioned steel wire which holds the concrete comprising the pipes in compression. When the steel wire is corroded by water seeping through mortar encapsulating the pipe, the steel wire eventually ruptures, thus relieving compression in the concrete adjacent the rupture. Sonic and ultrasonic sound waves traversing the concrete of pipes have different characteristics for pipe in good condition as compared to the characteristics of sound waves traversing pipe in poor condition due to decompression and/or other causes. The sound waves in pipe in poor condition travel slower with shear waves having less amplitude and reflections occurring at later times. In addition, the frequency domain characteristics of pipe in poor condition differ from the frequency domain characteristics of pipe in good condition.
    Type: Grant
    Filed: June 7, 1994
    Date of Patent: July 30, 1996
    Assignee: Washington Suburban Sanitary Commission
    Inventors: Michael W. Woodcock, Richard J. Holt
  • Patent number: 5160707
    Abstract: After aerating sewage sludge in a composting process, a stream of process air is treated to remove odors therefrom by injecting into the airstream an atomized mixture of dilute sulfuric acid and dilute surfactant to remove ammonia and odorous organic compounds therefrom. The airstream is then oxidized with bleach to remove sulfides and treated with a hydrogen peroxide solution to remove chlorine introduced by the bleach while maintaining the oxidation reaction. A dilution fan is used to further dilute the scrubbed airstream as the airstream is exhausted to the atmosphere.
    Type: Grant
    Filed: December 7, 1990
    Date of Patent: November 3, 1992
    Assignee: Washington Suburban Sanitary Commission
    Inventors: Charles M. Murray, Joel L. Thompson, Lawrence H. Hentz, Jr.
  • Patent number: 4994245
    Abstract: After aerating sewage sludge in a composting process, a stream of process air is treated to remove odors therefrom by injecting into the airstream an atomized mixture of dilute sulfuric acid and dilute surfactant to remove ammonia and odorous organic compounds therefrom. The airstream is then oxidized with bleach to remove sulfides and treated with a hydrogen peroxide solution to remove chlorine introduced by the bleach while maintaining the oxidation reaction. A dilution fan is used to further dilute the scrubbed airstream as the airstream is exhausted to the atmosphere.
    Type: Grant
    Filed: August 25, 1989
    Date of Patent: February 19, 1991
    Assignee: Washington Suburban Sanitary Commission
    Inventors: Charles M. Murray, Joel L. Thompson, Lawrence H. Hentz, Jr.
  • Patent number: 4945754
    Abstract: A test water meter including a digital display is portable, as well as battery-operated. The digital display includes a gallon-per-minute display and a total gallon display, each of which is resettable at any time, as well as an additional total gallon display which has a reset enabled through a security switch so that only selected personnel can reset the additional total gallon display. The test water meter includes a pair of outlet valves, one controlling a standard 4-inch outlet and the other controlling a standard 3/4-inch outlet. Just upstream of each valve a meter is positioned. Associated with each meter is a transmitter for transmitting data indicative of flow rates and volumes to the digital display. Associated with the large meter is an indicator plate generally indicating flow rates as a function of valve position, the valve position being indicated by a pointer fixed to the valve spindle.
    Type: Grant
    Filed: July 18, 1989
    Date of Patent: August 7, 1990
    Assignee: Washington Suburban Sanitary Commission
    Inventors: Edward E. Wissman, Jr., Leonard M. Guralnick, Michael A. Perini
  • Patent number: 4805862
    Abstract: A harness is provided for supporting a water meter on a fire hydrant so as to minimize the possibility of the water meter being accidentally dislodged from the first hydrant. The harness comprises a first loop which fits around the conical top of the fire hydrant and a second loop which fits around a portion of the water meter. A rod extends between the two loops and tensioning means is provided to draw the two loops toward one another via advancing the rod so as to both pull the water meter back toward the fire hydrant and to suspend that end of the water meter to which a water hose is attached from the conical top of the fire hydrant.
    Type: Grant
    Filed: July 30, 1987
    Date of Patent: February 21, 1989
    Assignee: Washington Suburban Sanitary Commission
    Inventor: Edward E. Wissman