Patents by Inventor Dean M. Dowdle

Dean M. Dowdle 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).

  • Magnetomechanical markers for marking stationary assets
    Patent number: 9638822
    Abstract: An article, system and method related to a magnetomechanical marker used to mark stationary assets. Magnetomechanical markers can be arranged in clusters and associated with stationary assets, including assets buried underground. Markers can be associated with an asset by being attached to the asset, arranged in a particular spatial relationship with the asset, or in any other appropriate way. A portable locating device can be used to generate an alternating magnetic field to activate the magnetomechanical marker and thus locate the asset.
    Type: Grant
    Filed: April 21, 2015
    Date of Patent: May 2, 2017
    Assignee: 3M Innovative Properties Company
    Inventors: Ziyad H. Doany, Dean M. Dowdle, Michael E. Hamerly, William C. Egbert, Terrence H. Joyce, Jr.
  • Single turn magnetic drive loop for electronic article surveillance
    Patent number: 9424724
    Abstract: A single turn loop electronic article surveillance (EAS) gate. The gate includes a closed magnetic core, a multi-turn primary winding wound around the core, and a secondary loop passing through the core once. The secondary loop is a self-supporting single turn loop, and the secondary loop is a transmit loop that generates a magnetic drive field for the article detection gate system.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: August 23, 2016
    Assignee: BIBLIOTHECA RFID LIBRARY SYSTEMS AG
    Inventors: Ronald D. Jesme, Dean M. Dowdle
  • MAGNETOMECHANICAL MARKERS FOR MARKING STATIONARY ASSETS
    Publication number: 20150226872
    Abstract: An article, system and method related to a magnetomechanical marker used to mark stationary assets. Magnetomechanical markers can be arranged in clusters and associated with stationary assets, including assets buried underground. Markers can be associated with an asset by being attached to the asset, arranged in a particular spatial relationship with the asset, or in any other appropriate way. A portable locating device can be used to generate an alternating magnetic field to activate the magnetomechanical marker and thus locate the asset.
    Type: Application
    Filed: April 21, 2015
    Publication date: August 13, 2015
    Inventors: Ziyad H. Doany, Dean M. Dowdle, Michael E. Hamerly, William C. Egbert, Terrence H. Joyce, JR.
  • Magnetomechanical markers for marking stationary assets
    Patent number: 9013274
    Abstract: An article, system and method related to a magnetomechanical marker used to mark stationary assets. Magnetomechanical markers can be arranged in clusters and associated with stationary assets, including assets buried underground. Markers can be associated with an asset by being attached to the asset, arranged in a particular spatial relationship with the asset, or in any other appropriate way. A portable locating device can be used to generate an alternating magnetic field to activate the magnetomechanical marker and thus locate the asset.
    Type: Grant
    Filed: September 22, 2010
    Date of Patent: April 21, 2015
    Assignee: 3M Innovative Properties Company
    Inventors: Ziyad H. Doany, Dean M. Dowdle, Michael E. Hamerly, William C. Egbert, Terrence H. Joyce, Jr.
  • SINGLE TURN MAGNETIC DRIVE LOOP FOR ELECTRONIC ARTICLE SURVEILLANCE
    Publication number: 20150035716
    Abstract: A single turn loop electronic article surveillance (EAS) gate. The gate includes a closed magnetic core, a multi-turn primary winding wound around the core, and a secondary loop passing through the core once. The secondary loop is a self-supporting single turn loop, and the secondary loop is a transmit loop that generates a magnetic drive field for the article detection gate system.
    Type: Application
    Filed: August 2, 2013
    Publication date: February 5, 2015
    Applicant: 3M Innovative Properties Company
    Inventors: Ronald D. Jesme, Dean M. Dowdle
  • FLEXIBLE MAGNETIC CORE ELECTRONIC MARKER
    Publication number: 20120325359
    Abstract: An electronic marker and method of making an electronic marker for marking obscured articles. The marker includes a core made of flexible, and sometimes high permeability magnetic material and a solenoid disposed around the core. A capacitor is electrically coupled with the solenoid, and the marker is tuned to respond to a signal at a characteristic resonant frequency. The marker can attached to a conduit to be buried underground. The marker can further include a radio frequency identification chip.
    Type: Application
    Filed: June 27, 2011
    Publication date: December 27, 2012
    Inventors: Ziyad H. Doany, Dean M. Dowdle, William C. Egbert, Michael E. Hamerly, Terrence H. Joyce, JR.
  • MAGNETOMECHANICAL MARKERS FOR MARKING STATIONARY ASSETS
    Publication number: 20120068823
    Abstract: An article, system and method related to a magnetomechanical marker used to mark stationary assets. Magnetomechanical markers can be arranged in clusters and associated with stationary assets, including assets buried underground. Markers can be associated with an asset by being attached to the asset, arranged in a particular spatial relationship with the asset, or in any other appropriate way. A portable locating device can be used to generate an alternating magnetic field to activate the magnetomechanical marker and thus locate the asset.
    Type: Application
    Filed: September 22, 2010
    Publication date: March 22, 2012
    Inventors: Ziyad H. Doany, Dean M. Dowdle, Michael E. Hamerly, William C. Egbert, Terrence H. Joyce, JR.
  • Variable frequency RF electronic surveillance system
    Patent number: 4609911
    Abstract: An electronic article surveillance system is disclosed, having a transmitter means for producing in an interrogation zone sequences containing a plurality of discrete different radio frequencies thereby causing a circuit present within the zone to resonate at its resonant frequency in response to energy absorbed at at least three different frequencies. A receiver means is provided to cause an alarm in the event of detection of three such resonances over two successive sequences.
    Type: Grant
    Filed: July 19, 1985
    Date of Patent: September 2, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Gary E. Nourse, Dean M. Dowdle
  • Variable frequency RF electronic surveillance system
    Patent number: 4531117
    Abstract: An electronic article surveillance system is disclosed, having a transmitter means for producing in an interrogation zone sequences containing a plurality of discrete different radio frequencies thereby causing a circuit present within the zone to resonate at its resonant frequency in response to energy absorbed at at least three different frequencies. A receiver means is provided to cause an alarm in the event of detection of three such resonances over two successive sequences.
    Type: Grant
    Filed: July 5, 1983
    Date of Patent: July 23, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Gary E. Nourse, Dean M. Dowdle
  • Shielded, closely spaced transmit-receiver antennas for electronic article surveillance system
    Patent number: 4509039
    Abstract: A shielded, closely spaced transmit-receiver system for use in an electronic article surveillance system is disclosed wherein at least one of the antennas is provided with at least two twisted loops lying in a common plane each loop being twisted 180.degree. to be in phase opposition with the adjacent loop and wherein both antennas are substantially enclosed by a conductive shield having a discontinuity in an outer portion enclosing each of the twisted loops.
    Type: Grant
    Filed: July 5, 1983
    Date of Patent: April 2, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Dean M. Dowdle