Patents by Inventor David Cresswell

David Cresswell 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).

  • Modified Zeolites and their Use in the Recycling of Plactics Waste
    Publication number: 20120165583
    Abstract: The present invention relates to a method for the recycling of plastics materials, in particular waste plastics materials, into chemical feed stocks and hydrocarbon fractions. The present invention also relates to novel zeolite based catalysts used in such methods. The present invention also relates to methods of manufacturing such zeolite based catalysts. Plastics waste is traditionally disposed of by land-fill, incineration or recycling by re-processing the waste into raw material for reuse. Each of these disposal methods has its disadvantages. The drawbacks of land-fill are self apparent. Although incineration may include energy recovery, there still remains the obvious problem of CO2 emission and the emission of other toxic pollutants. Additionally, recycling the plastics requires sorting of the plastics waste because certain types of plastics materials are not recyclable, and mixtures of plastics can be problematic.
    Type: Application
    Filed: June 3, 2010
    Publication date: June 28, 2012
    Applicant: University of Manchester
    Inventors: Arthur Garforth, Jesus Hernandez-Martinez, Aaron Akah, Michael Cooke, David Cresswell
  • Diaphragm and a diaphragm pump
    Patent number: 7647860
    Abstract: A diaphragm for a diaphragm pump, which diaphragm is asymmetrical about its longitudinal axis wherein the diaphragm has a central portion and a surrounding annular convolute portion. The convolute portion has a minimum depth and a maximum depth at diametrically opposed positions of the annular convolute. The convolute depth gradually increases from the minimum depth to the maximum depth between the diametrically opposed positions along each opposing half-section of the annular convolute. The invention also provides a diaphragm pump with the asymmetrical diaphragm.
    Type: Grant
    Filed: August 26, 2005
    Date of Patent: January 19, 2010
    Assignee: Munster Simms Engineering Limited
    Inventors: David Cresswell, Richard Bovill
  • Diaphragm And A Diaphragm Pump
    Publication number: 20080110336
    Abstract: A diaphragm for a diaphragm pump, which diaphragm is asymmetrical about its longitudinal axis wherein the diaphragm has a central portion and a surrounding annular convolute portion. The convolute portion has a minimum depth and a maximum depth at diametrically opposed positions of the annular convolute. The convolute depth gradually increases from the minimum depth to the maximum depth between the diametrically opposed positions along each opposing half-section of the annular convolute. The invention also provides a diaphragm pump with the asymmetrical diaphragm.
    Type: Application
    Filed: August 26, 2005
    Publication date: May 15, 2008
    Inventors: David Cresswell, Richard Bovill
  • Catalyst for ammonia oxidation
    Patent number: 5122497
    Abstract: Lithia doped cobalt oxide ammonia oxidation catalyst having a lithium to cobalt atomic ratio in the range 0.6 to 1.5.
    Type: Grant
    Filed: March 6, 1991
    Date of Patent: June 16, 1992
    Assignee: Imperial Chemical Industries PLC
    Inventors: David Cresswell, Nigel M. Sammes
  • Ammonia oxidation
    Patent number: 5041276
    Abstract: Lithia doped cobalt oxide ammonia oxidation catalyst having a lithium to cobalt atomic ratio in the range 0.6 to 1.5.
    Type: Grant
    Filed: January 23, 1990
    Date of Patent: August 20, 1991
    Assignee: Imperial Chemical Industries PLC
    Inventors: David Cresswell, Nigel M. Sammes