Patents by Inventor Wendell L. Pieper

Wendell L. Pieper 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).

  • Patent number: 5367106
    Abstract: In a primary process for hydroformylating olefins in the presence of a rhodium-containing catalyst solution to produce aldehydes and a gaseous effluent comprising unreacted olefin is vented, the improvement which comprises employing the effluent as a reactant feed for a coupled secondary hydroformylation process conducted jointly therewith in which the catalyst solution is cycled back and forth between the primary and secondary hydroformylation processes.
    Type: Grant
    Filed: September 20, 1993
    Date of Patent: November 22, 1994
    Assignee: Hoechst Celanese Corporation
    Inventors: Jerry D. Unruh, Wendell L. Pieper, Milo C. Pass
  • Patent number: 4151209
    Abstract: In a process for hydroformylating an olefin in the presence of a catalyst comprising rhodium in complex combination with carbon monoxide and a triorganophosphorus ligand, progressive deactivation of the catalyst, as well as loss of the ligand species through by-product formation, are reduced by continuously stripping the liquid reaction medium to a degree such that the content of high-boiling organophosphorus by-products therein is maintained at a low level such that the ratio of phosphorus contained in said high-boiling by-products to phosphorus contained in the ligand present in the reaction medium does not exceed about 0.2.
    Type: Grant
    Filed: October 28, 1977
    Date of Patent: April 24, 1979
    Assignee: Celanese Corporation
    Inventors: James L. Paul, Wendell L. Pieper, Leslie E. Wade