Patents by Inventor Irina Valcheva Hadjiilieva

Irina Valcheva Hadjiilieva 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).

  • Composition for preventing adhesion of damp earth on metal surfaces
    Patent number: 4032356
    Abstract: A composition for preventing the adhesion of damp earth on the metal surfaces of mechanical ore transport equipment, such as carriages, is described. The composition contains 30-85% by weight of an oleous liquid representing a by-product of the generation of cyclohexanon during the production of caprolactam. The remainder of the composition are waste products obtained from oil refining, specifically a heavy xylene fraction generated as a by-product of the hydration of pyrolized gasoline, or a highly aromatic viscous oil.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: June 28, 1977
    Assignee: Mnipki "Minprojekt"
    Inventors: Ruscho Panayotov Hadjiiliev, Maria Ivanova Todorova, Tzvetan Obretenov Georgiev, Kubrat Vassilev Naydenov, Dinko Mihaylov Jechev, Yanka Bogdanova Staneva, Irina Valcheva Hadjiilieva