Patents by Inventor Esther Spaltenstein

Esther Spaltenstein 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).

  • Acetal derivatives of resole compounds
    Patent number: 5677414
    Abstract: Cyclic acetal derivative of a resole includes the reaction product of an ortho resole compound with a carbonyl compound or a carbonyl compound derivative. The cyclic acetal derivatives of phenolic resole compounds exhibit enhanced storage stability and can be readily activated at elevated temperatures to prepare phenolic based adhesives and coatings.
    Type: Grant
    Filed: April 25, 1996
    Date of Patent: October 14, 1997
    Assignee: Lord Corporation
    Inventors: Esther Spaltenstein, Ernest B. Troughton, Jr.
  • Acetal derivatives of resole compounds
    Patent number: 5663246
    Abstract: Cyclic acetal derivative of a resole includes the reaction product of an ortho resole compound with a carbonyl compound or a carbonyl compound derivative. The cyclic acetal derivatives of phenolic resole compounds exhibit enhanced storage stability and can be readily activated at elevated temperatures to prepare phenolic based adhesives and coatings.
    Type: Grant
    Filed: October 26, 1994
    Date of Patent: September 2, 1997
    Assignee: Lord Corporation
    Inventors: Esther Spaltenstein, Ernest B. Troughton, Jr.
  • Catalytic reduction of organic carbonyls
    Patent number: 5286878
    Abstract: A process is provided whereby organic carbonyl substrates, including esters, ketones and amides, are reduced in a reaction with a silane reducing reagent and a catalyst. Effective catalysts broadly include those which consist of a group 4, 5 or 6 metal which either: a) is in less than its maximum oxidation state or is capable of being converted to a complex in less than its maximum oxidation state; and/or is a group 4, 5 or 6 metal hydride. Exemplary catalysts include titanium-containing catalysts such as (bis trimethylphosphine) titanocene, trimethyl phosphine adduct of a (hydrido) silyl complex of titanocene, titanocene dichloride and titanocene monochloride.
    Type: Grant
    Filed: November 21, 1990
    Date of Patent: February 15, 1994
    Assignee: Massachusetts Institute of Technology
    Inventors: Stephen L. Buchwald, Kristina A. Kreutzer, Esther Spaltenstein