Patents by Inventor Tadeusz W. Zerda

Tadeusz W. Zerda 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).

  • Method of measuring pore diameters by positronium decay
    Patent number: 4897549
    Abstract: A method is shown for measuring naturally occurring pores in a specimen material. A positron is emitted from a radioactive source and enters a material to pick up an electron to form positronium. The positronium decays very rapidly into two gamma rays. The lifetime of the positronium depends on the size of the pore it is trapped within. The larger the pore, the longer the positronium will last. By measuring the decay rate of positrons over an extended time scale in the range from 30 to 500 nsec., a near relation can be developed between positronium lifetime and pore diameter.
    Type: Grant
    Filed: December 19, 1988
    Date of Patent: January 30, 1990
    Inventors: Tadeusz W. Zerda, Bruce Miller, C. A. Quarles