Patents Represented by Attorney Robert H. Montgomery

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  • Antenna system with directional switching means
    Patent number: 4418351
    Abstract: An antenna system comprising a plurality of angularly disposed antennae which are selectively actuated to transmit dependent on the directional orientation of the transmitter with respect to a receiving station.
    Type: Grant
    Filed: April 13, 1981
    Date of Patent: November 29, 1983
    Inventor: John D. Fackler
  • Ribbon loudspeaker
    Patent number: 4395592
    Abstract: A ribbon loudspeaker is suitable for incorporation into a sound reproduction system without additionally requiring a transformer or series resistor. In one form in which the loudspeaker is bi-directional, a sound reproduction ribbon is received in a pair of magnetic gaps formed from a magnetic system employing a single magnet.
    Type: Grant
    Filed: March 6, 1981
    Date of Patent: July 26, 1983
    Assignee: Mark Levinson Audio Systems Ltd.
    Inventor: Thomas P. Colangelo
  • Zoom lens
    Patent number: 4394072
    Abstract: A new and improved zoom lens comprises four groups. The powers of the groups from the object end to the image end are positive, negative, negative, and positive, respectively. The first group is stationery for zooming but moves for close focusing. The second and third groups move in the same direction for zooming.
    Type: Grant
    Filed: December 5, 1980
    Date of Patent: July 19, 1983
    Assignee: Vivitar Corporation
    Inventor: Ellis I. Betensky
  • Cannulae grinding method and machine
    Patent number: 4384942
    Abstract: A method and system for continuously grinding tubing to finished cannulae, where the tubing is loaded in a carrier and the carrier is continuously guided past stations which cut the primary bevel, finish the butt end, clean the cut ends, and then make lancelet cuts on the primary bevel. The system further includes a cannula carrier and guide system which permits the cannulae to be unclamped, rotated and reclamped prior to each lancelet cutting station.
    Type: Grant
    Filed: September 8, 1980
    Date of Patent: May 24, 1983
    Assignee: Lifeline Products, Inc.
    Inventor: John J. Glowacki
  • Door closer with hold open feature
    Patent number: 4357731
    Abstract: A dashpot type door closer having an internal mechanism which will latch the door in an open position when the door is opened a sufficient distance, and which will release the door from a latched open position when the door is moved slightly more in the opening direction. A piston rod having a latching member extends through the internal mechanism and the latching member is pivoted between latched and unlatched positions by the internal mechanism.
    Type: Grant
    Filed: January 17, 1980
    Date of Patent: November 9, 1982
    Assignee: Leigh Products, Inc.
    Inventor: Leopold Strauss
  • Method of manufacture of hypodermic syringe
    Patent number: 4342184
    Abstract: A method of manufacture of pre-filled ampuls and hypodermic needles where an ampul is formed by injection-moulding and blow-moulding. The ampul is filled with medicaments at the blow-moulding stage and a hypodermic needle is then affixed to the ampul.
    Type: Grant
    Filed: April 4, 1980
    Date of Patent: August 3, 1982
    Inventors: William F. Van Eck, Maurits J. H. Van Eck
  • Grinding system
    Patent number: 3975864
    Abstract: A method and apparatus for grinding work which dresses a grinding wheel which comprises sensing the surface of the grinding wheel at the finish dimension after the grinding wheel has been advanced in predetermined increments, then retracting the wheel a predetermined distance so that the surface of the grinding wheel is always in the same position prior to initiation of a grinding cycle.
    Type: Grant
    Filed: August 8, 1973
    Date of Patent: August 24, 1976
    Inventor: John J. Glowacki