Patents by Inventor David S. Kashdan

David S. Kashdan 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).

  • Controlled-release delivery system
    Patent number: 5356634
    Abstract: Provided is a controlled-release system for delivery of bioactive materials such as medicaments, cosmetic ingredients and agrichemicals using cellulose acetate succinate or certain blends of cellulose acetate phthalate polymers as enteric coating materials. Also provided is a method for delivering active ingredients to animals utilizing the controlled-release system of the invention.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: October 18, 1994
    Assignee: Eastman Chemical Company
    Inventors: Stephen H. Wu, Carol J. Greene, Shane K. Kirk, David S. Kashdan
  • Acid-curable cellulose esters containing melamine pendent groups
    Patent number: 5182379
    Abstract: Modified cellulose esters are described that are prepared by grafting melamine moieties onto the backbone of cellulose esters. The resulting materials are useful in coating applications for wood, leather, and metal substrates and yield highly solvent-resistant coatings with enhanced properties when heated in the presence of an acid catalyst.
    Type: Grant
    Filed: June 5, 1990
    Date of Patent: January 26, 1993
    Assignee: Eastman Kodak Company
    Inventors: Phillip M. Cook, David S. Kashdan
  • Polymer blends having reverse phase morphology for controlled delivery of bioactive agents
    Patent number: 4795641
    Abstract: Disclosed are polymer blends containing a minor amount of cellulose acetate and a major amount of cellulose acetate phthalate, cellulose acetate trimellitate or cellulose acetate succinate. The blends have reverse phase morphology, that is, the minor component forms a continuous phase. The blends are useful for zero-order controlled delivery of bioactive agents such as pharmaceutical and agricultural chemicals.
    Type: Grant
    Filed: August 20, 1987
    Date of Patent: January 3, 1989
    Assignee: Eastman Kodak Company
    Inventor: David S. Kashdan
  • Process for the preparation of N-(2-(cyclo-hexen-1-yl)ethyl)-4-methoxybenzeneacetamide
    Patent number: 4496762
    Abstract: An improved method for preparing a compound having the formula ##STR1## which is an intermediate in the preparation of dextromethorphan, the improved method comprises the steps of(A) hydrogenating a compound having the formula ##STR2## in the presence of a hydrogenation catalyst to obtain a compound having the formula ##STR3## (B) hydrogenating the product of Step (A) in the presence of a hydrogen treated rhodium catalyst to obtain a compound having the formula ##STR4## (C) reacting the product of Step (B) with 4-methoxyphenylacetic acid to obtain a mixture of compounds comprising ##STR5## (D) dehydrating the product mixture of Step (C).
    Type: Grant
    Filed: March 29, 1983
    Date of Patent: January 29, 1985
    Assignee: Eastman Kodak Company
    Inventor: David S. Kashdan
  • Process for preparation of aromatic acid chlorides
    Patent number: 4374770
    Abstract: Disclosed is a process for converting aromatic aldehydes to the corresponding acid chlorides by reacting an aromatic aldehyde with sulfuryl chloride in the presence of a catalytic amount of a phosphine, phosphine oxide or phosphonium compound. The product compounds produced by the process of this invention are useful as chemical synthesis intermediates in the preparation of pharmaceuticals, dyes, herbicides and photographic chemicals.
    Type: Grant
    Filed: October 8, 1981
    Date of Patent: February 22, 1983
    Assignee: Eastman Kodak Company
    Inventors: John A. Hyatt, David S. Kashdan