Patents by Inventor Joseph Feinstein

Joseph Feinstein 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).

  • Short-period electron beam wiggler
    Patent number: 4876687
    Abstract: A free-electron laser has a wiggler for a linear electron beam comprising two sets of magnetic polepieces 26, 28 periodically spaced along opposite sides of the beam. The polepieces of one set 28 are displaced along the beam from the other set 26 by one-half period. A uniform longitudinal magnetomotive force generates fields between polepieces having transverse components 22 alternating between the sets 26, 28, providing a very short periodicity and hence, high frequency wave radiation.
    Type: Grant
    Filed: February 13, 1989
    Date of Patent: October 24, 1989
    Assignee: Varian Associates, Inc.
    Inventor: Joseph Feinstein
  • Mode suppressors for whispering gallery gyrotron
    Patent number: 4851788
    Abstract: A gyrotron interaction resonator 29 operating in a TE.sub.n1 cavity mode has an array of longitudinal slots 32 in the conductive wall 30. The slots 32 are spaced to couple to the unwanted TE.sub.n1 modes and to other modes of differing n and not to the desired mode. Wave-absorptive material 34 spaced from the inner cavity wall 28 and coupled to slots 32 absorbs the unwanted modes.
    Type: Grant
    Filed: June 1, 1988
    Date of Patent: July 25, 1989
    Assignee: Varian Associates, Inc.
    Inventors: Robert L. Ives, Howard R. Jory, Joseph Feinstein