Patents by Inventor Derek W. Spence

Derek W. Spence 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).

  • Patent number: 4721234
    Abstract: An apparatus for the application of crease setting compositions comprises at least one moveable arm capable of insertion into the leg of a pair of trousers to be creased carrying at or near one end thereof an applicator head 10 comprising a cartridge 12 having a nozzle 22 for the application of crease setting composition. Guide means 20, in the form of a pivotted crease sensing blade, are provided for locating the nozzle 22 within the crease to be treated. The guide means 20 is moveable transversely of the direction of the motion of the trousers in order to locate in the trouser crease and the cartridge 12 is rotatable so that the nozzle 22 can follow in the track of said guide means.
    Type: Grant
    Filed: October 7, 1986
    Date of Patent: January 26, 1988
    Assignee: Wool Development International Limited
    Inventor: Derek W. Spence
  • Patent number: 4451380
    Abstract: An apparatus for separating heavy solids from an effluent, for example wool scouring effluent, comprising a tank having a solids discharge outlet at its base and an ultra-sonic sensor located at a predetermined distance from this outlet. Means responsive to the output of the sensor, for example a solonoid controled valve, are provided for opening the discharge outlet when the solids concentration exceeds the preset limit. Preferably, a secondary settlement tank immediately below and directly communicating with the main tank is provided and the discharge outlet, controlled by a suitable valve, is at the base of the secondary tank. The secondary tank has a zone offset from the main solid flow in which the sensor may be located in order that large aggregates of solids do not lead to spurious operation of the sensor.
    Type: Grant
    Filed: December 3, 1981
    Date of Patent: May 29, 1984
    Inventor: Derek W. Spence