Patents by Inventor Daniel Howard Legg

Daniel Howard Legg 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).

  • Catalyst production for use in a process for fluorination of hydrocarbons
    Patent number: 5741748
    Abstract: A process for the removal of fluoride from a spent chromium-based fluroination catalyst by contacting the catalyst with potassium hydroxide to produce a suspension of solid hydrated chromium oxide in aqueous potassium fluoride. The solid hydrated chromium oxide may be separated from the solution, washed with water and/or aqueous acid, and contacted with nitric acid to produce a chromium (HI) nitrate solution from which a chromium-based catalyst may be prepared by precipitation of hydrated chromium oxide therefrom with aqueous alkali, and washing, drying and calcining the hydrated chromium oxide.
    Type: Grant
    Filed: March 17, 1995
    Date of Patent: April 21, 1998
    Assignee: Imperial Chemical Industries PLC
    Inventors: John Graham Allen, Daniel Howard Legg