Patents by Inventor David Ian Rochester

David Ian Rochester 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).

  • Process for the production of titanium oxide
    Patent number: 6090354
    Abstract: A process for production of titanium oxide comprises digesting an ilmenite ore in which at least 92% by weight of the iron which is present is in the ferrous form, if necessary adding a reducing agent and subsequently precipitating hydrous titanium oxide. When a reducing agent is added the amount used is equivalent to less than 4.0% by weight metallic iron calculated with respect to ilmenite ore. The process enables an increased throughput on a pigment plant and less co-product in the form of iron compounds is produced.
    Type: Grant
    Filed: March 24, 1997
    Date of Patent: July 18, 2000
    Assignee: Tioxide Group Services Limited
    Inventors: John Henry Russell, David Ian Rochester, Kenneth Burns, Roger Philip Bacon