Patents by Inventor John H. Skinner

John H. Skinner 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: 10060965
    Abstract: An apparatus to test an Ethernet powered device includes a processor including a power negotiation supervisor, a DC power source, a first interface having an Ethernet medium dependent interface and a coupling circuit that inserts DC power onto one or more wire pairs of the first interface. The apparatus further includes a first bridging circuit, a measuring circuit to measure characteristics of DC power delivered to Ethernet powered device. The DC power source is configurable over a range of voltage levels including a plurality of operating voltages which are applied to the Ethernet powered device and the power negotiation supervisor processes power negotiation protocol messages.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: August 28, 2018
    Assignee: Sifos Technologies, Inc.
    Inventors: John H. Skinner, Kendrick R. Bennett, Peter G. Johnson
  • Publication number: 20180238971
    Abstract: Systems to assess pair-to-pair unbalance characteristics of an Ethernet powered device (PD) and pair-to-pair unbalance characteristics of an Ethernet power source (PSE) include a controller, a pair of controlled electrical resistance circuits each having a DC current measurement circuit to measure pair-to-pair unbalance and a calibration circuit.
    Type: Application
    Filed: February 21, 2018
    Publication date: August 23, 2018
    Inventors: Kendrick R. Bennett, Peter G. Johnson, John H. Skinner
  • Patent number: 9203730
    Abstract: Methods and apparatus provide for a system to measure transceiver parameters and test network interfaces at a physical layer without requiring specialized interface fixtures and excessive preparation and intervention.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: December 1, 2015
    Assignee: Sifos Technologies, Inc.
    Inventors: Peter G. Johnson, John H. Skinner, Kendrick R. Bennett
  • Patent number: 4299676
    Abstract: A process is provided for recovering silver and plastics material from photographic film. For exposed film, film is shredded or chopped, subjected to bleach treatment, washed, and subjected to fixing treatment, the fixing solution being circulated in closed circuit through an electrolytic silver recovery plant in which silver is deposited on one or more cathodes. For unexposed film, the bleach and washing steps can be omitted. For high silver recovery, the main fixing treatment is followed by a tailings treatment in fix solution, the tailings solution being circulated through a separate silver recovery unit of lower capacity and lower power. To maintain the fixing solution pH, a first wash in plain water is followed, before fixing, by a second wash in water treated with an alkaline chemical to raise its pH.
    Type: Grant
    Filed: March 27, 1980
    Date of Patent: November 10, 1981
    Assignee: Photographic Silver Recovery Limited
    Inventors: John H. Skinner, James S. Bentley