Patents by Inventor Frank Weiner Heerdt

Frank Weiner Heerdt 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).

  • Drive circuit for electrical load
    Patent number: 9762141
    Abstract: A circuit for an electrical load comprises a passive transformer, the secondary of which is connected to power cells for each phase according to the transformer tappings. Each power cell comprises a low cost but efficient power factor correction circuit to produce lower harmonics on the transformer.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: September 12, 2017
    Assignee: NIDEC CONTROL TECHNIQUES LIMITED
    Inventor: Frank Weiner Heerdt
  • Electrical protection device and method
    Patent number: 9337640
    Abstract: A voltage measurement is made between two points in a circuit. If the measured voltage exceeds a predetermined amount, a switch is operated to electrically connect the two points.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: May 10, 2016
    Assignee: CONTROL TECHNIQUES LIMITED
    Inventor: Frank Weiner Heerdt
  • Drive Circuit For Electrical Load
    Publication number: 20140246913
    Abstract: A circuit for an electrical load comprises a passive transformer, the secondary of which is connected to power cells for each phase according to the transformer tappings. Each power cell comprises a low cost but efficient power factor correction circuit to produce lower harmonics on the transformer.
    Type: Application
    Filed: March 3, 2014
    Publication date: September 4, 2014
    Applicant: Control Techniques Limited
    Inventor: Frank Weiner Heerdt
  • Electrical Protection Device And Method
    Publication number: 20140233136
    Abstract: A voltage measurement is made between two points in a circuit. If the measured voltage exceeds a predetermined amount, a switch is operated to electrically connect the two points.
    Type: Application
    Filed: February 14, 2014
    Publication date: August 21, 2014
    Applicant: Control Techniques Limited
    Inventor: Frank Weiner Heerdt