Patents by Inventor Wolfgang Rosenfeldt

Wolfgang Rosenfeldt 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).

  • Constant speed regulator for DC motors
    Patent number: 4388572
    Abstract: An electric motor is supplied a voltage from a control circuit. The control circuit is powered by an AC to DC rectifier having a shunt capacity. An increase in motor load will result in lower speed and an increase in current. This causes an increase in AC ripple across the shunt capacitor. The control circuit is responsive to the AC ripple and increases voltage to the motor so that the speed set before the application of load is again attained.
    Type: Grant
    Filed: May 15, 1980
    Date of Patent: June 14, 1983
    Assignee: Sybron Corporation
    Inventor: Wolfgang Rosenfeldt
  • Priority system dental instrument delivery
    Patent number: 4351634
    Abstract: A dental delivery unit carries a number of dental instruments in nests. Upon selection, one nest is extended carrying its instrument to the dentist's group. Selection is accomplished by a priority system. Associated with each nest is a switch. Activation of any switch starts a selection period by a priority system. At the end of the selection period the nest corresponding to the last to be activated switch is extended by the priority system.If two switches are activated together the nest corresponding to the furthermost switch is extended.
    Type: Grant
    Filed: May 15, 1980
    Date of Patent: September 28, 1982
    Assignee: Sybron Corporation
    Inventor: Wolfgang Rosenfeldt