Patents Represented by Attorney, Agent or Law Firm Hoffmann, Wasson & Gitler
  • Frequency selective pulse
    Patent number: 6441613
    Abstract: A method of NMR (nuclear magnetic resonance) excitation of a sample having a magnetic moment, including, applying a longitudinal magnetic field to the sample; and changing the magnetic moment in a substantially continuous manner by moving an effective magnetic-field vector &ohgr;e more than 90°, wherein for all portions of the sample in which the moment is changed, the angular velocity of the effective field vector at at least one angle, 90°+&agr;, is different from the angular velocity at 90°−&agr;.
    Type: Grant
    Filed: August 22, 1997
    Date of Patent: August 27, 2002
    Assignee: GE Medical Systems
    Inventors: Daniel Rosenfeld, Shimon L. Panfil, Yuval Zur
  • Polymer bound hindered amine light stabilizers
    Patent number: RE34791
    Abstract: Polymer bound hindered amine light stabilizers are prepared by reacting hindered amine light stabilizers containing reactive hydrazide functionalities with anhydride containing polymers or copolymers. The reactions may be carried out in an inert solvent or in a melt blending step. The polymer bound hindered amine light stabilizers are useful alone or may also be used to stabilize other polymers, copolymers or polymers blends against the deleterious effects of heat and/or light.
    Type: Grant
    Filed: July 16, 1991
    Date of Patent: November 15, 1994
    Assignee: Atochem North America, Inc.
    Inventors: Robert T. Kazmierzak, Ronald E. MacLeay