Patents by Inventor William Stewart Allen

William Stewart Allen 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 trioxane from formaldehyde
    Patent number: 5767294
    Abstract: A process for the trimerization of aqueous formaldehyde solution to produce trioxane in a multistage in situ catalyst reactor-extractor column containing a cationic exchange resin. The process entails countercurrent flow of formaldehyde solution and solvent across reactor and extractor stages wherein trioxane, produced from formaldehyde at the reactor stages, is subsequently separated at the extractor stages utilizing a suitable solvent.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: June 16, 1998
    Assignee: Hoechst Celanese Corporation
    Inventors: Douglas W. Steele, Mahmood N. A. Jawaid, William Stewart Allen, Norwood E. Thames, Jr., Dwight A. Reck