Patents by Inventor Melvin C. Baker

Melvin C. Baker 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).

  • Preparation of polytetramethylene ether glycol using an acidic zirconia catalyst
    Patent number: 5149862
    Abstract: A process for polymerizing tetrahydrofuran to produce polytetramethylene ether glycol or ester-capped polytetramethylene ether glycol is disclosed. The reaction mass is carried out at 10.degree. to 80.degree. C. and preferably 20.degree. to 60.degree. C. In a preferred aspect of the invention, a mixture of acetic anhydride and acetic acid is present in the reaction mixture.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: September 22, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Suriyanarayan Dorai, Melvin C. Baker, James A. Schultz
  • Method for reducing color of poly(tetramethylene ether) glycol with hypochlorite
    Patent number: 4525580
    Abstract: The level of yellow color sometimes associated with poly(tetramethylene ether) glycol can be reduced by bringing the poly(tetramethylene ether) glycol into contact with hypochlorite ions.
    Type: Grant
    Filed: July 26, 1984
    Date of Patent: June 25, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Melvin C. Baker
  • Method for reducing color formation in polyesters
    Patent number: 4128535
    Abstract: Color formation in a polyester formed of a saturated acid, a glycol and 1,4-butanediol can be reduced if, during preparation of the polyester, a reaction mass is first formed of the acid and the glycol and the butanediol is then added to the reaction mass after the acid-glycol reaction is practically complete.
    Type: Grant
    Filed: September 19, 1977
    Date of Patent: December 5, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Melvin C. Baker