Patents by Inventor Ronald H. Engebrecht

Ronald H. Engebrecht 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).

  • 14-crown-4-ether derivatives
    Patent number: 5245021
    Abstract: Named compounds are useful in making dry analytical elements for assaying lithium in serum. The compounds have the general structure: ##STR1## wherein R, R.sub.1, R.sub.2 and X are as presented below:______________________________________ R R.sub.1 R.sub.2 X ______________________________________ n-C.sub.12 H.sub.25 SO.sub.2 CH.sub.3 CH.sub.3 CH n-C.sub.12 H.sub.25 NO.sub.2 CH.sub.3 CH CH.sub.3 SO.sub.2 N(n-C.sub.6 H.sub.13).sub.2 CH.sub.3 CH CH.sub.2 C.sub.6 H.sub.5 SO.sub.2 N(n-C.sub.6 H.sub.13).sub.2 CH.sub.3 CH CH.sub.2 C.sub.6 H.sub.5 SO.sub.2 N(CH.sub.3)-n-C.sub.18 H.sub.37 CH.sub.3 CH CH.sub.3 NO.sub.2 n-C.sub.7 H.sub.15 CH n-C.sub.12 H.sub.25 H CH.sub.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: September 14, 1993
    Assignee: Eastman Kodak Company
    Inventors: Ronald H. Engebrecht, Thomas R. Welter
  • Dry analytical element for lithium assay
    Patent number: 5188802
    Abstract: A novel 14-crown 4-ether derivative is disclosed for use in a dry analytical element for assaying lithium.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: February 23, 1993
    Assignee: Eastman Kodak Company
    Inventors: James R. Schaeffer, Ronald H. Engebrecht, Robert F. Winterkorn, Harold C. Warren, III, Thomas R. Welter
  • Intermediates for making 14-crown-4-ether derivatives
    Patent number: 5132436
    Abstract: Intermediate compounds for the preparation of useful 14-crown-4-ether derivatives are presented. The intermediates have the structure: ##STR1## wherein R represents CH.sub.3, n-C.sub.12 H.sub.25 and CH.sub.2 C.sub.6 H.sub.5 ; and R.sub.2 represents CH.sub.3, and n-C.sub.7 H.sub.15.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: July 21, 1992
    Assignee: Eastman Kodak Company
    Inventors: Ronald H. Engebrecht, Thomas R. Welter
  • Acid-resistant copolymer and photographic element incorporating same
    Patent number: 4152159
    Abstract: A photocrosslinkable polymer and imaging element containing said polymer are described wherein acid resistance is achieved by vinyl ester recurring units. A process for etching an element so prepared features exposure, development, and etching in an acid bath.
    Type: Grant
    Filed: April 3, 1978
    Date of Patent: May 1, 1979
    Assignee: Eastman Kodak Company
    Inventors: Robert C. Daly, Ronald H. Engebrecht