Patents Represented by Law Firm Shapiro and Shaprio
  • Zoom lens
    Patent number: 4398807
    Abstract: An improvement in zoom lenses of the type consisting of four lens groups of positive, negative, positive, power positive and arranged in this order as viewed from the object side is disclosed. The improved zoom lenses exhibit excellent high focusing ability even for close distance photographing with higher magnification.
    Type: Grant
    Filed: February 17, 1981
    Date of Patent: August 16, 1983
    Assignee: Nippon Kogaku K. K.
    Inventor: Yutaka Iizuka
  • Apparatus for degrading Q in a high-Q RF pulse transmitting system and the like
    Patent number: 4059801
    Abstract: A high-Q, pulse transmitting antenna system is disclosed, as of the Loran type, wherein a simple solidstate circuit, employing mainly passive elements serves, during quiescent periods between transmissions, to introduce loss into the antenna circuit, thereby selectively to lower the Q of the antenna circuit and thus prevent spurious oscillations therein during such quiescent periods.
    Type: Grant
    Filed: December 11, 1975
    Date of Patent: November 22, 1977
    Inventors: Paul R. Johannessen, Peter Ver Planck