Patents by Inventor Dave Demmer

Dave Demmer 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: 20130175438
    Abstract: Detector assembly for downhole spectroscopy includes a near-infra-red quaternary photodiode that can operate at high temperatures without cooling it to the standard operation temperature range of the photodiode. High temperature operation of the photodiode right shifts the detector assembly's responsivity curve to include wavelengths of up to 2400-nm. The photodiode has manageable dark current at temperatures even at 200° C., and it can be packaged using high temperature construction. The photodiode is operated in photovoltaic mode at high temperatures but can be operated at photoconductive mode at lower temperatures. At least partial cooling can be provided above a predetermined temperature.
    Type: Application
    Filed: May 23, 2011
    Publication date: July 11, 2013
    Applicant: PRECISION ENERGY SERVICES, INC.
    Inventors: Jess V. Ford, Bryan W. Kasperski, Sean M. Christian, Tom Haslett, Dave Demmer, Joseph Dallas, Dave Winick
  • Patent number: 8411262
    Abstract: A downhole fluid analysis tool has a housing and a flow passage for downhole fluid. A device disposed in the tool housing relative to the flow passage has a one or more sources, one or more sensing optics, one or more detectors, and control circuitry. The source generates an input signal. The sensing optic has a refractive index (RI) higher than crude oil and other expected constituents. A sensing surface of the optic optically coupled to the source interfaces with a downhole fluid. When the variable RI of the downhole fluid reaches a defined relationship to the optic's RI, the input signal interacting with the sensing surface experiences total internal reflection, and the reflected signal from the sensing surface remains in the sensing optic and reflects to a detector. The control circuitry monitors the detector's response and indicates gas break out if the response is above a threshold.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: April 2, 2013
    Assignee: Precision Energy Services, Inc.
    Inventors: Jess V. Ford, Sean M. Christian, Bryan W. Kasperski, Tom Haslett, Dave Demmer, Margaret C. Waid, Mike Yuratich
  • Publication number: 20120298850
    Abstract: Detector assembly for downhole spectroscopy includes a near-infra-red quaternary photodiode that can operate at high temperatures without cooling it to the standard operation temperature range of the photodiode. High temperature operation of the photodiode right shifts the detector assembly's responsivity curve to include wavelengths of up to 2400-nm. The photodiode has manageable dark current at temperatures even at 200° C., and it can be packaged using high temperature construction. The photodiode is operated in photovoltaic mode at high temperatures but can be operated at photoconductive mode at lower temperatures. At least partial cooling can be provided above a predetermined temperature.
    Type: Application
    Filed: May 23, 2011
    Publication date: November 29, 2012
    Applicant: PRECISION ENERGY SERVICES, INC.
    Inventors: Jess V. Ford, Bryan W. Kasperski, Sean M. Christian, Tom Haslett, Dave Demmer, Joseph Dallas, Dave Winick
  • Publication number: 20120081699
    Abstract: A downhole fluid analysis tool has a housing and a flow passage for downhole fluid. A device disposed in the tool housing relative to the flow passage has a one or more sources, one or more sensing optics, one or more detectors, and control circuitry. The source generates an input signal. The sensing optic has a refractive index (RI) higher than crude oil and other expected constituents. A sensing surface of the optic optically coupled to the source interfaces with a downhole fluid. When the variable RI of the downhole fluid reaches a defined relationship to the optic's RI, the input signal interacting with the sensing surface experiences total internal reflection, and the reflected signal from the sensing surface remains in the sensing optic and reflects to a detector. The control circuitry monitors the detector's response and indicates gas break out if the response is above a threshold.
    Type: Application
    Filed: September 30, 2010
    Publication date: April 5, 2012
    Applicant: PRECISION ENERGY SERVICES, INC.
    Inventors: Jess V. Ford, Sean M. Christian, Bryan W. Kasperski, Tom Haslett, Dave Demmer, Margaret C. Waid, Mike Yuratich
  • Publication number: 20020163004
    Abstract: A gate for an optical signal having a waveguide which can be coupled to a source of optical signals, where the waveguide comprises a cladding surrounding a core. A gate material is provided which is sized, shaped and positioned outside of the core such that an optical signal passing along the core interacts with said gate material. A source of power stimulates the gate material and the power source is switchable between on and off. The optical signal is attenuated by interacting with said gate material when the power is off and amplified by interacting with said gate material when the power is on. In one embodiment the gate is packaged into a planar light circuit having a multiplexer/demultiplexer at either end and a gate region including a plurality of gates. A method of forming such a device is also shown.
    Type: Application
    Filed: February 7, 2002
    Publication date: November 7, 2002
    Applicant: Photonami, Inc.
    Inventors: Mike Liwak, Robert B. Thayer, Tom Haslett, Dave Demmer