Patents by Inventor Dale S. Walker
Dale S. Walker 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).
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Patent number: 8255980Abstract: Systems and methods for managing router configuration devices in a secure data communication network are described herein. An illustrative system includes a plurality of programmed external configuration devices and a configuration device programmer. Each programmed external configuration device contains at least a portion of a definition of a secure data path between a first router and a second router. Each programmed external configuration device can be detachably coupled to a first router to create a secure data path between the first router and a second router. The configuration device programmer writes a secure data path definition into a selected external configuration device if a predetermined number of programmed external configuration devices are coupled to the configuration device programmer.Type: GrantFiled: February 3, 2009Date of Patent: August 28, 2012Assignee: ERF Wireless, Inc.Inventor: Dale S. Walker
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Patent number: 7926090Abstract: Systems and methods for creating and operating separate secure networks over a non-secure network are described herein. Some illustrative embodiments include a system that includes a router with one or more ports and control logic coupled to the one or more ports (the control logic capable of establishing a plurality of secure data paths with at least one other router across a network), and a plurality of external storage devices (each storage device separate from the router but capable of being detachably coupled to a port of the one or more ports, and each external storage device comprising configuration data defining one or more secure data paths of the plurality of secure data paths). Configuration data stored in a first external storage device of the plurality of external storage devices is different from configuration data stored in a second external storage device of the plurality of external storage devices.Type: GrantFiled: July 13, 2007Date of Patent: April 12, 2011Assignee: ERF Wireless, Inc.Inventors: Edward J. Blevins, John Arley Burns, Dale S. Walker, Ricky C. White
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Patent number: 7818790Abstract: A network of routers is monitored by a monitoring server. Each router implements various security mechanisms to secure the operation of the routers. For example, each router comprises control logic that implements a security protocol dictated, at least in part, by contents of at least two separate external storage devices, each storage device separate from, but coupled to, one of the ports of said router.Type: GrantFiled: September 20, 2006Date of Patent: October 19, 2010Assignee: ERF Wireless, Inc.Inventors: John Arley Burns, Edward J. Blevins, John Adrian Burns, Charles C. Hardin, Samuel D. Hartman, Dale S. Walker, Ricky C. White
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Publication number: 20100199329Abstract: Systems and methods for managing router configuration devices in a secure data communication network are described herein. An illustrative system includes a plurality of programmed external configuration devices and a configuration device programmer. Each programmed external configuration device contains at least a portion of a definition of a secure data path between a first router and a second router. Each programmed external configuration device can be detachably coupled to a first router to create a secure data path between the first router and a second router. The configuration device programmer writes a secure data path definition into a selected external configuration device if a predetermined number of programmed external configuration devices are coupled to the configuration device programmer.Type: ApplicationFiled: February 3, 2009Publication date: August 5, 2010Applicant: ERF WIRELESS, INC.Inventor: Dale S. WALKER
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Publication number: 20090016357Abstract: Systems and methods for creating and operating separate secure networks over a non-secure network are described herein. Some illustrative embodiments include a system that includes a router with one or more ports and control logic coupled to the one or more ports (the control logic capable of establishing a plurality of secure data paths with at least one other router across a network), and a plurality of external storage devices (each storage device separate from the router but capable of being detachably coupled to a port of the one or more ports, and each external storage device comprising configuration data defining one or more secure data paths of the plurality of secure data paths). Configuration data stored in a first external storage device of the plurality of external storage devices is different from configuration data stored in a second external storage device of the plurality of external storage devices.Type: ApplicationFiled: July 13, 2007Publication date: January 15, 2009Applicant: ERF WIRELESS, INC.Inventors: Edward J. BLEVINS, John Arley BURNS, Dale S. WALKER, Ricky C. WHITE
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Publication number: 20080235514Abstract: Systems for safeguarding router configuration data are described herein. Some illustrative embodiments include a system that includes a network router, a configuration device comprising configuration data used to configure the network router, and a connector capable of detachably coupling the configuration device to the network router and further capable of detachably coupling a second device to the network router (the connector routes electrical power provided by the network router to a coupled device). The electrical power is set to a voltage level usable to operate the configuration device, while capable of rendering the second device inoperative.Type: ApplicationFiled: March 22, 2007Publication date: September 25, 2008Applicant: ERF WIRELESS, INC.Inventor: Dale S. Walker
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Patent number: 6967779Abstract: A micro-lens array with a precisely aligned aperture mask, and a method of forming the same, is provided. The aperture mask is formed by projecting light onto a mask layer using each lenslet in the micro-lens array. The intensity of the light and the mask layer material are chosen so that the light forms apertures in the mask layer via a non-ablative process. The resulting apertures are automatically aligned with their respective lenslets.Type: GrantFiled: June 3, 2003Date of Patent: November 22, 2005Assignee: Bright View Technologies, Inc.Inventors: Edward Fadel, Robert P. Freese, David Reed, Dale S. Walker
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Patent number: 6829087Abstract: A light-transmission screen includes a diffusing element formed from a micro-lens array for projecting images in a viewing space. The screen generates images of improved quality by varying structural features of one or more lenses in the array so that light is directed in different directions and/or with different optical properties compared with other lenses in the array. The structural features which are varied include any one or more of size, shape, curvature, or spacing of the lenses in the array. As a result of these variations, the screen achieves wider viewing angles, improved screen resolution and gain, and a greater ability to reduce or eliminate aliasing or other artifacts in the generated images compared with conventional screens. A method for making a light-transmission screen of this type preferably forms the micro-lens array using a stamping operation based on a master.Type: GrantFiled: June 3, 2003Date of Patent: December 7, 2004Assignee: Bright View Technologies, Inc.Inventors: Robert P. Freese, David Reed, Dale S. Walker
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Patent number: 6816306Abstract: A light-transmission screen includes a diffusing element formed from a micro-lens array for projecting images in a viewing space. The screen generates images of improved quality by varying structural features of one or more lenses in the array so that light is directed in different directions and/or with different optical properties compared with other lenses in the array. The structural features which are varied include any one or more of size, shape, curvature, or spacing of the lenses in the array. As a result of these variations, the screen achieves wider viewing angles, improved screen resolution and gain, and a greater ability to reduce or eliminate aliasing or other artifacts in the generated images compared with conventional screens. A method for making a light-transmission screen of this type preferably forms the micro-lens array using a stamping operation based on a master.Type: GrantFiled: June 3, 2003Date of Patent: November 9, 2004Assignee: Bright View Technologies Inc.Inventors: Robert P. Freese, David Reed, Dale S. Walker
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Publication number: 20040188875Abstract: Screen apparatuses are provided which include a first lens or holographic optical element layer and a second mask layer. The first layer substantially collimates image light rays to impinge on the mask layer. The mask layer provides an array or matrix of projecting members. Each of the projecting members receives and focuses the substantially collimated light rays to corresponding focal points. The mask layer includes a mask that blocks light transmission except where openings are located. The openings allow the light focused through the focal joints to substantially pass through the mask to form an image. The screen apparatuses can be advantageously employed in display apparatuses.Type: ApplicationFiled: April 14, 2004Publication date: September 30, 2004Inventors: Richard M. Knox, Dale S. Walker
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Patent number: 6788460Abstract: Screen apparatuses are provided which include a first lens or holographic optical element layer and a second mask layer. The first layer substantially collimates image light rays to impinge on the mask layer. The mask layer provides an array or matrix of projecting members. Each of the projecting members receives and focuses the substantially collimated light rays to corresponding focal points. The mask layer includes a mask that blocks light transmission except where openings are located. The openings allow the light focused through the focal joints to substantially pass through the mask to form an image. The screen apparatuses can be advantageously employed in display apparatuses.Type: GrantFiled: April 12, 2002Date of Patent: September 7, 2004Assignee: Duke UniversityInventors: Richard M. Knox, Dale S. Walker
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Patent number: 6768566Abstract: A screen apparatus includes a holographic optical element and a diffuser. The holographic optical element may be constructed using standard techniques known in the field of holography. The holographic optical element may be used to replace a typical Fresnel lens used in projection screen apparatuses. In operation, the holographic optical element receives image light from an image engine or projector and redirects the image light to the diffuser for scattering. The holographic optical element can be designed to substantially collimate, converge, or diverge the image light. The combination of the holographic optical element and the diffuser provides improved illumination uniformity that can be perceived by a viewer as the viewer moves in directions transverse to the screen apparatus. The screen apparatus may be designed to provide improved illumination uniformity to optimized or optimal locations in a viewing region. The screen apparatus may be advantageously employed in display apparatuses.Type: GrantFiled: April 15, 2002Date of Patent: July 27, 2004Assignee: Duke UniversityInventor: Dale S. Walker
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Publication number: 20040017612Abstract: A micro-lens array with a precisely aligned aperture mask, and a method of forming the same, is provided. The aperture mask is formed by projecting light onto a mask layer using each lenslet in the micro-lens array. The intensity of the light and the mask layer material are chosen so that the light forms apertures in the mask layer via a non-ablative process. The resulting apertures are automatically aligned with their respective lenslets.Type: ApplicationFiled: June 3, 2003Publication date: January 29, 2004Applicant: Bright View Technologies, Inc.Inventors: Edward Fadel, Robert P. Freese, David Reed, Dale S. Walker
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Publication number: 20040008411Abstract: A light-transmission screen includes a diffusing element formed from a micro-lens array for projecting images in a viewing space. The screen generates images of improved quality by varying structural features of one 0or more lenses In the array so that light is directed in different directions and/or with different optical properties compared with other lenses in the array. The structural features which are varied include any one or more of size, shape, curvature, or spacing of the lenses in the array. As a result of these variations, the screen achieves wider viewing angles, improved screen resolution and gain, and a greater ability to reduce or eliminate aliasing or other artifacts in the generated images compared with conventional screens. A method for making a light-transmission screen of this type preferably forms the micro-lens array using a stamping operation based on a master.Type: ApplicationFiled: June 3, 2003Publication date: January 15, 2004Applicant: Bright View Technologies, Inc.Inventors: Robert P. Freese, David Reed, Dale S. Walker
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Publication number: 20030210462Abstract: A light-transmission screen includes a diffusing element formed from a micro-lens array for projecting images in a viewing space. The screen generates images of improved quality by varying structural features of one or more lenses in the array so that light is directed in different directions and/or with different optical properties compared with other lenses in the array. The structural features which are varied include any one or more of size, shape, curvature, or spacing of the lenses in the array. As a result of these variations, the screen achieves wider viewing angles, improved screen resolution and gain, and a greater ability to reduce or eliminate aliasing or other artifacts in the generated images compared with conventional screens. A method for making a light-transmission screen of this type preferably forms the micro-lens array using a stamping operation based on a master.Type: ApplicationFiled: June 3, 2003Publication date: November 13, 2003Applicant: Bright View Technologies, Inc.Inventors: Robert P. Freese, David Reed, Dale S. Walker
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Publication number: 20030206342Abstract: A light-transmission screen includes a diffusing element formed from a micro-lens array for projecting images in a viewing space. The screen generates images of improved quality by varying structural features of one or more lenses in the array so that light is directed in different directions and/or with different optical properties compared with other lenses in the array. The structural features which are varied include any one or more of size, shape, curvature, or spacing of the lenses in the array. As a result of these variations, the screen achieves wider viewing angles, improved screen resolution and gain, and a greater ability to reduce or eliminate aliasing or other artifacts in the generated images compared with conventional screens. A method for making a light-transmission screen of this type preferably forms the micro-lens array using a stamping operation based on a master.Type: ApplicationFiled: June 3, 2003Publication date: November 6, 2003Applicant: Bright View Technologies, Inc.Inventors: David Reed, Robert P. Freese, Dale S. Walker
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Patent number: 6535196Abstract: In a color sequential system using LCDs, the LCD must operate faster than the frame rate because red, green, and blue are done sequentially. Ferroelectric LCDs can do this, but they are not analog devices and so cannot provide analog display levels. Instead, a pulse width modulation (PWM) technique is used. In the system of the present invention, each pixel has three storage devices to hold RGB analog levels. A latch is used to load these values in parallel. Then an analog 3:1 multiplexer is used to select the proper storage device for the current sequential color. The multiplexer output goes to a comparator, which has a sawtooth waveform input at much faster than the frame rate. The comparator output changes with the sawtooth level, so that PWM control is provided for each pixel. As an alternative, standard analog LCD pixels can be sequentially switched between three color input storage devices.Type: GrantFiled: May 3, 2001Date of Patent: March 18, 2003Assignee: Duke UniversityInventors: Dale S. Walker, Richard M. Knox
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Publication number: 20030038999Abstract: Screen apparatuses are provided which include a first lens or holographic optical element layer and a second mask layer. The first layer substantially collimates image light rays to impinge on the mask layer. The mask layer provides an array or matrix of projecting members. Each of the projecting members receives and focuses the substantially collimated light rays to corresponding focal points. The mask layer includes a mask that blocks light transmission except where openings are located. The openings allow the light focused through the focal joints to substantially pass through the mask to form an image. The screen apparatuses can be advantageously employed in display apparatuses.Type: ApplicationFiled: April 12, 2002Publication date: February 27, 2003Inventors: Richard M. Knox, Dale S. Walker
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Patent number: 6483612Abstract: A screen apparatus includes a holographic optical element and a diffuser. The holographic optical element may be constructed using standard techniques known in the field of holography. The holographic optical element may be used to replace a typical Fresnel lens used in projection screen apparatuses. In operation, the holographic optical element receives image light from an image engine or projector and redirects the image light to the diffuser for scattering. The holographic optical element can be designed to substantially collimate, converge, or diverge the image light. The combination of the holographic optical element and the diffuser provides improved illumination uniformity that can be perceived by a viewer as the viewer moves in directions transverse to the screen apparatus. The screen apparatus may be designed to provide improved illumination uniformity to optimized or optimal locations in a viewing region. The screen apparatus may be advantageously employed in display apparatuses.Type: GrantFiled: April 5, 2000Date of Patent: November 19, 2002Assignee: Duke UniversityInventor: Dale S. Walker
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Publication number: 20020159109Abstract: A screen apparatus includes a holographic optical element and a diffuser. The holographic optical element may be constructed using standard techniques known in the field of holography. The holographic optical element may be used to replace a typical Fresnel lens used in projection screen apparatuses. In operation, the holographic optical element receives image light from an image engine or projector and redirects the image light to the diffuser for scattering. The holographic optical element can be designed to substantially collimate, converge, or diverge the image light. The combination of the holographic optical element and the diffuser provides improved illumination uniformity that can be perceived by a viewer as the viewer moves in directions transverse to the screen apparatus. The screen apparatus may be designed to provide improved illumination uniformity to optimized or optimal locations in a viewing region. The screen apparatus may be advantageously employed in display apparatuses.Type: ApplicationFiled: April 15, 2002Publication date: October 31, 2002Applicant: Duke UniversityInventor: Dale S. Walker