Patents by Inventor Holger Wilhelm Vind

Holger Wilhelm Vind 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).

  • Method of making high-duty PTC-resistor
    Patent number: 3981075
    Abstract: A method for making a heavy duty PTC resistor with a pressed and sintered hollow cylindrical body of a ceramic composition which has two end faces in a radial plane with a connection contact on each end face.
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: September 21, 1976
    Assignee: Danfoss A/S
    Inventor: Holger Wilhelm Vind
  • High-duty PTC-resistor and method for its manufacture
    Patent number: 3967229
    Abstract: A heavy duty PTC resistor with a pressed and sintered hollow cylindrical body of a ceramic composition which has two end faces in a radial plane with a connection contact on each end face.A heavy duty PTC resistor sintered body of a ceramic composition which has two end-faces carrying a connection contact; the invention also concerns a method of manufacturing such PTC-resistor.High duty PTC-resistors are required for some purposes. If for example a PTC-resistor is used as a starting device for a single-phase motor, it has to be designed to deal with almost the entire mains voltage and to carry power of 500 W or more. The usual cylindrical bodies, provided at their two end-faces with connection contacts, frequently exhibit cracks under loads of this kind.A high-duty PTC-resistor is thus known (German Patent Specification OS 1 465 349) which is made up of a stack of solid or hollow flat cylindrical discs, the end-faces of the superposed discs being interconncted by a contact layer.
    Type: Grant
    Filed: November 6, 1974
    Date of Patent: June 29, 1976
    Assignee: Danfoss A/S
    Inventor: Holger Wilhelm Vind