Patents by Inventor David A. Zeller, Jr.

David A. Zeller, 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).

  • Single line telephone communication system
    Patent number: 4821319
    Abstract: A communication system for use with a single pair of externally provided telephone wires and a single pair of in-house wires for the provision of full intercom services and/or PABX type features to a plurality of subsets includes a line interface module connected between the single pair of externally supplied wires and a single pair of in-house wires. In addition, each subset is provided with a station adapter module between it and the single pair of in-house wires.
    Type: Grant
    Filed: May 5, 1987
    Date of Patent: April 11, 1989
    Assignee: Alcatel USA Corp.
    Inventors: Francisco A. Middleton, David A. Zeller, Jr.
  • Telephone line access apparatus
    Patent number: 4782480
    Abstract: A telephone line access apparatus includes a first stage for providing high voltage protection and a second stage filter in series with the first stage. The first and second stages are incorporated within a housing that is adapted to plug into an existing main distribution frame of a telephone central office.
    Type: Grant
    Filed: November 19, 1985
    Date of Patent: November 1, 1988
    Assignee: Alcatel USA, Corp.
    Inventors: Franklin Hargrave, Francisco A. Middleton, David A. Zeller, Jr.
  • Line access apparatus for in-band communication
    Patent number: 4750170
    Abstract: A line access apparatus for in-band communication includes a line coupler that functions as a high voltage isolation device and has a resonant frequency out of the signal transmission band. A carrier signal of about the resonant frequency is modulated at an in-band frequency to convey information across the line coupler.
    Type: Grant
    Filed: November 19, 1985
    Date of Patent: June 7, 1988
    Assignee: Alcatel USA Corporation
    Inventors: David A. Zeller, Jr., Francisco A. Middleton, Franklin Hargrave
  • Apparatus for optimizing the charging of a rechargeable battery
    Patent number: 4668902
    Abstract: An apparatus for optimizing the charging of a rechargeable battery includes, in parallel with the rechargeable battery, a series of diodes selected to exhibit an effective impedance that is the inverse of the impedance of the rechargeable battery regardless of the ambient temperature.
    Type: Grant
    Filed: April 9, 1986
    Date of Patent: May 26, 1987
    Assignee: ITT Corporation
    Inventor: David A. Zeller, Jr.
  • Information collecting and forwarding apparatus
    Patent number: 4654869
    Abstract: An apparatus for collecting and forwarding encoded information includes a source of power maintained from the output port thereof to provide power to the source of encoded informations whereby a local subscriber is not required to supply power to such encoders via the AC mains to his premises.
    Type: Grant
    Filed: September 11, 1985
    Date of Patent: March 31, 1987
    Assignee: ITT Corporation
    Inventors: Mark G. Smith, Karen J. French, David A. Zeller, Jr., Franklin Hargrave, Francisco A. Middleton
  • Test trunk access controller
    Patent number: 4646342
    Abstract: A test trunk access controller includes a test trunk interface controller accessed by a subscriber line assigned to a service provider, or other remote metering facility, and a test trunk interface device inter-connecting the test trunk controller with the test trunk device of a local telephone switch.
    Type: Grant
    Filed: September 11, 1985
    Date of Patent: February 24, 1987
    Assignee: ITT Corporation
    Inventors: Franklin Hargrave, David A. Zeller, Jr., Mark G. Smith, William L. Hull, III, Francisco A. Middleton