Patents by Inventor David Leslie Phillip Middleton

David Leslie Phillip Middleton 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).

  • Apparatus and method for preventing bacteria from propagating and removing bacteria in drink conveying pipe
    Patent number: 6510857
    Abstract: A conventional apparatus for preventing growth of microbia in a carrier tube by an electromagnetic field has no or little effect. An apparatus 1 serves to prevent growth of microbia propagating themselves on an internal wall of a carrier tube 63 for carrying beer and the like or to remove the microbia. The apparatus 1 comprises a control unit 2 for generating an electric signal including an audio frequency component, a transponder 3 including a coil 31 and a case 32 for housing the coil 31, and means for attaching the transponder 3 to an external wall of the carrier tube 63, and generates an audio electronic signal to be sent through the carrier tube 63 by applying the electric signal to the coil 31.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: January 28, 2003
    Inventor: David Leslie Phillip Middleton
  • Preventing contaminant build-up in beer lines
    Patent number: 5645697
    Abstract: Apparatus for preventing contaminant build-up in beer supply lines including a coil supported on a former located coaxially about the beer line. A signal generator is connected to the coil to apply a signal of varying frequency to the coil to prevent bacterial growth on the inside of the line.
    Type: Grant
    Filed: March 23, 1995
    Date of Patent: July 8, 1997
    Inventors: David Leslie Phillip Middleton, David Brian Telfer, Clive Barnes