Patents by Inventor David Hoke

David Hoke 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).

  • Cyan dye-forming couplers and photographic materials containing same
    Patent number: 4849328
    Abstract: Novel phenolic cyan dye-forming couplers are disclosed. The coupler compounds contain a p-cyanophenylureido group in the 2- position and an acylamino group in the 5- position of the phenolic ring. The acylamino group contains bulky substituents to provide steric interaction within the coupler molecule as well as within the dye molecule derived therefrom. The coupler compounds are useful in photographic recording materials.
    Type: Grant
    Filed: February 25, 1988
    Date of Patent: July 18, 1989
    Assignee: Eastman Kodak Company
    Inventors: David Hoke, Kenneth N. Kilminster
  • Cyan dye-forming couplers and photographic materials containing same
    Patent number: 4775616
    Abstract: Novel phenolic cyan dye-forming couplers contain a p-cyanophenylureido group in the 2-position and in the 5-position an acylamino substituent containing a sulfone group having bulky substituents sufficient to provide steric interaction within the coupler molecule and the dye molecule derived therefrom. The couplers are useful in photographic emulsions.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: October 4, 1988
    Assignee: Eastman Kodak Company
    Inventors: Kenneth N. Kilminster, David Hoke
  • Cyan dye-forming couplers and photographic materials containing same
    Patent number: 4753871
    Abstract: Novel phenolic cyan dye-forming couplers contain a p-cyanophenylureido group in the 2-position and in the 5-position an acylamino group containing bulky alicyclic or heterocyclic substituents sufficient to provide steric interaction within the coupler molecule and the dye molecule derived therefrom. The couplers are useful in photographic emulsions.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: June 28, 1988
    Assignee: Eastman Kodak Company
    Inventors: Kenneth N. Kilminster, David Hoke