Patents by Inventor Tamara Y. Kefeli

Tamara Y. Kefeli 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).

  • Reticulate polymers based on oligourethanacrylates and method for their manufacture
    Patent number: 4258164
    Abstract: A method for preparing olegourethanacrylates having the general formula ##STR1## where ##STR2## is a radical of a telogen; X is H, CH.sub.
    Type: Grant
    Filed: May 21, 1979
    Date of Patent: March 24, 1981
    Inventors: Alfred A. Berlin, Tamara Y. Kefeli, Nina V. Varlamova, Grigory M. Strongin, Judif M. Altshuler, Boris I. Kolomazov, Alexei V. Efimov
  • Oligourethanacrylates and methods for their manufacture
    Patent number: 4250322
    Abstract: A method for preparing oligourethanacrylates having the general formula ##STR1## where ##STR2## is a radical of a telogen; X is H, CH.sub.
    Type: Grant
    Filed: August 10, 1979
    Date of Patent: February 10, 1981
    Inventors: Alexei V. Efimov, Alfred A. Berlin, Tamara Y. Kefeli, Nina V. Varlamova, Grigory M. Strongin, Judif M. Altshuler, Boris I. Kolomazov
  • Liquid photopolymerizable composition for making printing forms
    Patent number: 4246336
    Abstract: A liquid photopolymerizable composition, according to the invention, consists of methyl methacrylate, benzoin or benzoin ethers, a photopolymerizable component--an oligocarbonate methacrylate or a mixture thereof with an oligoester acrylate or oligoester maleinate at a weight ratio of these oligomers in the mixture of 1:1, the components being taken in the following proportions (in % by weight):methyl methacrylate: 5-10benzoin or benzoin ethers: 0.1.0photopolymerizable component: the balanceLight sensitivity of this composition is up to 981 J/m.sup.2 in terms of exposure H at d=1 mm (wherein d is the thickness of a photopolymeric layer obtained by acting with UV-radiation on the composition; the radiation source - luminescent UV-lamps of 80 W total output. Printing forms made on the basis of this composition exhibit improved physical and mechanical properties. Thus, tensile strength of the printing forms is as high as 5.25 kgf/mm.sup.2 and durability, up to 1 million impressions.
    Type: Grant
    Filed: March 12, 1979
    Date of Patent: January 20, 1981
    Inventors: Alfred A. Berlin, Fedor I. Dubrovitsky, Eduard T. Lazarenko, Tamara Y. Kefeli, Khaim-Mordke A. Brikenshtein, Vladislav V. Bernatsek, Tatyana A. Zhizhileva, Boris V. Kovalenko, Natalya L. Marshavina, Roman I. Mervinsky, Anna A. Radugina, Anatoly R. Tischenko, Julia M. Fillipovskaya