Patents by Inventor Howard C. Welborn, Jr.

Howard C. Welborn, Jr. 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 preparation of alumoxanes
    Patent number: 4665208
    Abstract: A process for the preparation of hydrocarbylalumoxanes comprising oligomeric, linear and/or cyclic hydrocarbylalumoxanes, which comprises contacting a hydrocarbylaluminum dissolved in an inert dry organic liquid with a hydrated salt of a metal which is not reduced during contact with the trihydrocarbylaluminum at temperatures between -30.degree. C. and 110.degree. C.
    Type: Grant
    Filed: July 11, 1985
    Date of Patent: May 12, 1987
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Howard C. Welborn, Jr., Erik G. M. Tornqvist
  • Process and catalyst for producing polyethylene having a broad molecular weight distribution
    Patent number: 4530914
    Abstract: Polyolefins having a broad molecular weight distribution are obtained by polymerizing ethylene or higher alpha-olefins in the presence of a catalyst system comprising two or more metallocenes each having different propagation and termination rate constants and alumoxane.
    Type: Grant
    Filed: June 6, 1983
    Date of Patent: July 23, 1985
    Assignee: Exxon Research & Engineering Co.
    Inventors: John A. Ewen, Howard C. Welborn, Jr.