Patents by Inventor Lotar H. Hanusa

Lotar H. Hanusa 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).

  • Amine-initiated polyether polyols and a process for their production
    Patent number: 5786405
    Abstract: Clear, amine-initiated polyether polyols are made by epoxidizing an amine in the presence of an alkali metal hydroxide catalyst. After the desired degree of epoxidation has been achieved, a hydroxy-carboxylic acid is added to the epoxidized mixture in an amount sufficient to neutralize any remaining alkali metal hydroxide. The polyols produced in this manner are particularly useful for the production of polyurethane and apolyisocyanurate foams.
    Type: Grant
    Filed: November 1, 1996
    Date of Patent: July 28, 1998
    Assignee: Bayer Corporation
    Inventors: Steven L. Schilling, Herman P. Doerge, Lotar H. Hanusa
  • Gating for production of rigid polyurethane foam
    Patent number: 5753155
    Abstract: The present invention is directed to an improved method for preparing a product by introducing a rigid polyurethane foam formulation into a cavity defined by two spaced apart formed sheets and allowing the formulation to foam. In one embodiment, the improvement resides in providing at least one of the sheets with a portion having the shape of a gate of the type used in polyurethane reaction injection molding and introducing the formulation through that gate so that the formulation enters the cavity as a laminar stream.
    Type: Grant
    Filed: May 8, 1996
    Date of Patent: May 19, 1998
    Assignee: Bayer Corporation
    Inventor: Lotar H. Hanusa
  • Closed cell, rigid polyurethane foam
    Patent number: 5013766
    Abstract: The present invention is directed to the discovery that relatively long chain polyols, which are typically used to produce flexible foams, can be used to produced closed cell rigid polyurethane foams.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: May 7, 1991
    Assignee: Mobay Corporation
    Inventor: Lotar H. Hanusa