Patents by Inventor Robert M. Harnden

Robert M. Harnden 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).

  • Environmentally degradable polyethylene composition
    Patent number: 5096941
    Abstract: A polymeric composition which degrades in the presence of oxygen either photochemically or thermo-oxidatively comprising a blend of polyethylene, e.g. low density polyethylene and cerium (III) stearate.This composition is especially useful in degradable food wrap and packaging and as an agricultural mulch film.
    Type: Grant
    Filed: August 23, 1990
    Date of Patent: March 17, 1992
    Assignee: The Dow Chemical Company
    Inventor: Robert M. Harnden
  • Densifiable and re-expandable polyurethane foam
    Patent number: 5032622
    Abstract: Polyurethane foams having a specified glass transition temperature are densified for transportation or other purposes by heating the foam to a temperature above its T.sub.g, compressing the heated foam, and then cooling the compressed foam to a temperature below its T.sub.g. The cooled foam remains in a densified state until re-heated to a temperature above its T.sub.g, whereupon it re-expands to assume its original dimensions.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: July 16, 1991
    Assignee: The Dow Chemical Company
    Inventors: Ronald M. Herrington, Robert B. Turner, Robert M. Harnden
  • Preparation of 2-oxazolidinone and ethyleneurea
    Patent number: 4405794
    Abstract: The present invention provides a method for reacting urea and beta-hydroxyethylcarbamate to make 2-oxazolidinone and ethyleneurea in a good yield and high selectivity, whereby the reaction method can be controlled to provide either the 2-oxazolidinone or the ethyleneurea as the major reaction product.
    Type: Grant
    Filed: December 18, 1981
    Date of Patent: September 20, 1983
    Assignee: The Dow Chemical Company
    Inventors: Robert M. Harnden, Daniel W. Baugh, Jr.
  • Process for the manufacture of diethylenetriamine
    Patent number: 4387249
    Abstract: The present invention provides a selective process for the manufacture of diethylenetriamine from ethylenediamine, ethanolamine, and urea. The process comprises a reaction cycle in which ethylenediamine, ethanolamine, and urea are first reacted in step (a) to form aminoethylethyleneurea and ethyleneurea, which in turn are hydrolyzed in a second reaction step (b) to diethylenetriamine and ethylenediamine. The ethylenediamine made in the second reaction step (b) may be recycled to the first reaction step (a).
    Type: Grant
    Filed: December 18, 1981
    Date of Patent: June 7, 1983
    Assignee: The Dow Chemical Company
    Inventors: Robert M. Harnden, Donald W. Calvin