Patents by Inventor David W. Sims

David W. Sims 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).

  • Polymer cracking
    Patent number: 5364995
    Abstract: This invention relates to a process for the conversion of waste and/or fresh polymers, especially polyolefins, into lower hydrocarbons by vaporizing them in a fluidized bed of particulate material in the presence of a fluidizing gas at a temperature from 300.degree.-690.degree. C. The lower hydrocarbons can be further converted to useful olefins, paraffins or waxes by steam cracking the lower hydrocarbons, preferably in the absence of any catalyst. This is an effective and efficient method of recycling waste polymers.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: November 15, 1994
    Assignee: BP Chemicals Limited
    Inventors: Kenneth C. Kirkwood, Stephen A. Leng, David W. Sims