Grandfield
David Grandfield, Frisco, TX US
Patent application number | Description | Published |
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20100019035 | ARTICLE IDENTIFICATION SYSTEM - The present disclosure includes methods and systems for identifying articles. One method embodiment includes positioning a number of movable Faraday screens in particular locations relative to a number of different stages in a laundering process, and moving a mobile electronic identification device (EID) reader past the locations. | 01-28-2010 |
John E. Grandfield, Bristol, RI US
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20130069838 | DUAL BAND ELECTRICALLY SMALL TUNABLE ANTENNA - An electrically small dual-band planar tunable UHF/L-Band antenna. In one example, the dual-band antenna includes a combination of a semi-spiral antenna for the UHF frequencies and a microstrip patch antenna for the L-band frequencies. | 03-21-2013 |
John E. Grandfield, St. Petersburg, FL US
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20160043464 | Ground Plane Meandering in Z Direction for Spiral Antenna - An antenna has a spiral driven element that meanders in a z direction, perpendicular to the x-y plane of the spiral, and a ground plane that also meanders in the z direction, such that spacing between the ground plane and the driven element is an odd multiple of one-quarter wavelength, along at least a portion of the length of the driven element. The spacing promotes constructive interference from signals reflected by the ground plane, increasing the front-to-back ratio of the antenna and, thereby, providing gain. The ground plane of a wideband version of the spiral antenna meanders, such that the spacing varies between about an odd multiple of one-quarter wavelength of an upper frequency to about an odd multiple of one-quarter wavelength of a lower frequency of a frequency range, thereby providing gain over a range of frequencies. | 02-11-2016 |
John Francis Grandfield, Victoria AU
Patent application number | Description | Published |
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20080283212 | GAS LUBRICANT AND DELIVERY APPARATUS - A lubricant delivery element for delivering lubricant into a cavity, the lubricant distribution element comprising a thin element of porous material for delivering lubricant into the cavity through the element. | 11-20-2008 |
Walter J. Grandfield, Phoenix, AZ US
Patent application number | Description | Published |
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20100248660 | RF Multiband Transmitter with Balun - A multi-band RF transmitter circuit ( | 09-30-2010 |