Patents by Inventor Chang Mao Cheng

Chang Mao Cheng 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).

  • Publication number: 20160005520
    Abstract: An inductor and a method of manufacturing the same are disclosed. The inductor comprises: a magnetic core; at least a set of conducting coils, sleeved on the magnetic core, each of the conducting coils including a toroidal coil portion and two extending portions extending from two ends of the toroidal coil portion towards a same direction; the magnetic cover body, hermetically covering and fixing to peripherals of the conducting coil and the magnetic core; and an upper lid and the lower lid; wherein the magnetic core, the conducting coil, the magnetic cover body, the upper lid and the lower lid are integrally formed. Each of the magnetic core, the magnetic cover body, the upper lid and the lower lid includes components of an iron powder, a phosphoric acid, and a resin. When a coil turn number of the conducting coil exceeds a predetermined value, the toroidal coil portion includes at least two layers of parallelly disposed coil windings.
    Type: Application
    Filed: April 2, 2015
    Publication date: January 7, 2016
    Inventor: Chang Mao CHENG
  • Publication number: 20100039197
    Abstract: The invention of one inductor structure comprises one coil, which has one winding coil together with two extended terminals, and plural metal particles with magnetism at least where the winding coil inside plural metal particles is casted and sintered by the powder metallurgy technique and two extended terminals are flat and bended toward 90 degrees in automated punching equipment to become a one-piece chip inductor with costs & fabrication steps dramatically reduced and stable inductance provided.
    Type: Application
    Filed: August 12, 2008
    Publication date: February 18, 2010
    Inventor: Chang-Mao Cheng
  • Publication number: 20100037451
    Abstract: This invention of one method with respect to material selection and forming to solve aging of one inductor's iron core comprises materials such as iron powder, insulating compound, thinner, adhesive, and lubricant at least for mixing, agitating, and heating according to weight percentages of materials selected where a layer of protection film formed on surfaces of insulated powder particles by adhesives makes particles sustain the glass transition temperature of 600 Celsius degrees or so and one inductor with an aging-resistant feature is generated with a mixture held inside one mold cavity for a die-casting process via the powder metallurgy technique and then high-temperature sintering.
    Type: Application
    Filed: August 12, 2008
    Publication date: February 18, 2010
    Inventor: Chang-Mao Cheng
  • Patent number: 7281315
    Abstract: An inductor with the characteristic of resisting high current comprising a conductor coil and a magnet envelope, the magnet envelope tightly wraps the periphery of the conductor coil and forms the main body of the inductor, and the two extending parts of the conductor coil extend to outside of the main body of the inductor, forming terminal electrode. As of the manufacturing method, it includes the part of toroid coil and the extending parts composing the conductor coil. After the toroid coil part is winded into rings, the unwinded wire ends form the extending parts. Through magnet envelope die-casting and wrapping the molded magnet core of the conductor coil to form the main body of the inductor, and the extending parts of the conductor coil extend to outside of the main body to form the terminal electrode.
    Type: Grant
    Filed: October 20, 2005
    Date of Patent: October 16, 2007
    Inventor: Chang Mao Cheng
  • Patent number: 7142084
    Abstract: An inductor with the characteristic of resisting high current comprising a conductor coil and a magnet envelope, the magnet envelope tightly wraps the periphery of the conductor coil and forms the main body of the inductor, and the two extending parts of the conductor coil extend to outside of the main body of the inductor, forming terminal electrode. As of the manufacturing method, it includes the part of toroid coil and the extending parts composing the conductor coil. After the toroid coil part is winded into rings, the unwinded wire ends form the extending parts. Through magnet envelope die-casting and wrapping the molded magnet core of the conductor coil to form the main body of the inductor, and the extending parts of the conductor coil extend to outside of the main body to form the terminal electrode.
    Type: Grant
    Filed: January 31, 2005
    Date of Patent: November 28, 2006
    Inventor: Chang Mao Cheng