Patents by Inventor James H. Gentry, Jr.

James H. Gentry, Jr. 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).

  • Patent number: 4274052
    Abstract: It is known for current meters to operate by sensing the magnetic field produced by the unknown current being measured. Such meters may include a core (200-1) of magnetic material which may be opened to receive a current carrying conductor (400-1) and which is adapted to be coupled to the magnetic fields surrounding the conductor. Winding (300-1), placed around the core, is excited at a fundamental frequency as supplied by an ac source (110). Responsive thereto, an output voltage of twice or higher even harmonics of the exciting frequency is produced. The output voltage is proportional to the magnetic flux produced by the current being measured and hence may be extended through a meter for indicating the unknown current. Such arrangements tend to be expensive. The instant current meter (100) includes an arrangement for providing a dc current (190) through the core winding to neutralize the nonsymmetry of the magnetic field created by the unknown current.
    Type: Grant
    Filed: August 13, 1979
    Date of Patent: June 16, 1981
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: James H. Gentry, Jr., Gilbert J. Stiles, Sr.