Patents by Inventor Konstantin Nikolaev Kolev

Konstantin Nikolaev Kolev 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).

  • Positive-working photographic process and radiation elements utilizing a chalcogenide of arsenic imaging compound and a noble plating metal
    Patent number: 4075016
    Abstract: Radiation sensitive elements comprising a thin radiation sensitive layer of an amorphous chalcogenide of arsenic adhering to a substrate are utilized in the production of latent images when exposed to a suitable form of radiation, the latent images being developed by utilizing the inability of radiation exposed arsenic chalcogenide to cause reduction of noble metal salts. Noble metal salts are thus decomposed by arsenic chalcogenide which has not been exposed to radiation to form a direct positive image which can subsequently be intensified by physical development and/or electroless deposition of metal possibly followed by electrolytic deposition of metal. The form of radiation employed is generally visible light and diverse procedures for producing direct positive images are disclosed.
    Type: Grant
    Filed: January 6, 1976
    Date of Patent: February 21, 1978
    Assignee: Ziafop pri Ban
    Inventors: Atanas Tzvetanov Burov, Penka Atanassova Simidchieva, Konstantin Nikolaev Kolev
  • Direct-positive photographic material and method for its production
    Patent number: 3933496
    Abstract: This invention relates to a photographic material yielding upon exposure a direct-positive image and to a process for the production of such material.
    Type: Grant
    Filed: November 15, 1973
    Date of Patent: January 20, 1976
    Assignee: Zlafop pri Ban
    Inventors: Konstantin Nikolaev Kolev, Jordan Petrov Malinowski