Patents by Inventor Bruce Danver
Bruce Danver 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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Publication number: 20130053481Abstract: Compositions and methods for making compositions useful for imparting water resistance to gypsum products are disclosed. Processes for making gypsum products made from an emulsion of the composition are also disclosed. The compositions of the invention include at least one paraffin wax, a saponifiable wax, and a styrene-maleic anhydride copolymer. The composition may further include water and be in the form of an emulsion.Type: ApplicationFiled: August 17, 2012Publication date: February 28, 2013Inventors: Eduardo Romero-Nochebuena, Paresh Jaswantlal Sheth, Jason Lee Holder, Harden Christopher Wren, Michael Bruce Danvers
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Patent number: 6650418Abstract: A pair of fiber optic coils are mounted on opposite sides of a flexural disk and are arranged to form an interferometer that produces an output signal in response to acceleration of the flexural disk. The flexural disk is mounted in a housing having first and second end plates with a sidewall extending between them. A support member extends between the end plates and through a central passage in the flexural disk. A pair of compressive dampers is mounted in the housing between the flexural disk and the housing end plates. A shear damper mounted on the central support member exerts a radial force on an inner edge of the central passage in flexural disk to dampen vibrations of the flexural member and control the output signal amplitude over a selected frequency range.Type: GrantFiled: July 27, 2001Date of Patent: November 18, 2003Assignee: Litton Systems, Inc.Inventors: Michael J. Tweedy, Eric L. Goldner, Patrick J. Welton, Gregory M. Nau, Bruce A Danver
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Publication number: 20030020919Abstract: A pair of fiber optic coils are mounted on opposite sides of a flexural disk and are arranged to form an interferometer that produces an output signal in response to acceleration of the flexural disk. The flexural disk is mounted in a housing having first and second end plates with a sidewall extending between them. A support member extends between the end plates and through a central passage in the flexural disk. A pair of compressive dampers is mounted in the housing between the flexural disk and the housing end plates. A shear damper mounted on the central support member exerts a radial force on an inner edge of the central passage in flexural disk to dampen vibrations of the flexural member and control the output signal amplitude over a selected frequency range.Type: ApplicationFiled: July 27, 2001Publication date: January 30, 2003Inventors: Michael J. Tweedy, Eric L. Goldner, Patrick J. Welton, Gregory M. Nav, Bruce A. Danver
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Patent number: 6328837Abstract: The interferometric fiber optic accelerometer is viewed as a mass-spring transducer housed in a sensor case. The sensor case is attached to a moving part whose motion is inferred from the relative motion between the mass and the sensor case. A flexural disk is housed in a sensor case which is accelerated in a direction normal to the plate surface. The plate undergoes displacement resulting in strains on the plate surface. A coil of optical fiber, made to be part of an optical interferometer, is attached to the flexural disk, the strain from the disk is transferred to the fiber thus changing the path length of the fiber interferometer. The interferometer output in demodulated providing the acceleration response. The design of the accelerometer housing is such that it is highly immune to extraneous signals, i.e., dynamic and hydrostatic pressure.Type: GrantFiled: December 2, 1999Date of Patent: December 11, 2001Assignee: The United States of America as represented by the Secretary of the NavyInventors: Sandeep T. Vohra, Bruce Danver, Alan Tveten, Anthony Dandridge
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Patent number: 6056032Abstract: The interferometric fiber optic accelerometer is viewed as a mass-spring nsducer housed in a sensor case. The sensor case is attached to a moving part whose motion is inferred from the relative motion between the mass and the sensor case. A flexural disk is housed in a sensor case which is accelerated in a direction normal to the plate surface. The plate undergoes displacement resulting in strains on the plate surface. A coil of optical fiber, made to be part of an optical interferometer, is attached to the flexural disk, the strain from the disk is transferred to the fiber thus changing the path length of the fiber interferometer. The interferometer output in demodulated providing the acceleration response. The design of the accelerometer housing is such that it is highly immune to extraneous signals, i.e., dynamic and hydrostatic pressure.Type: GrantFiled: August 21, 1998Date of Patent: May 2, 2000Assignee: The United States of America represented by the Secretary of the NavyInventors: Sandeep T. Vohra, Bruce Danver, Alan Tveten, Anthony Dandridge
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Patent number: 5903349Abstract: The interferometric fiber optic accelerometer is viewed as a mass-spring transducer housed in a sensor case. The sensor case is attached to a moving part whose motion is inferred from the relative motion between the mass and the sensor case. A flexural disk is housed in a sensor case which is accelerated in a direction normal to the plate surface. The plate undergoes displacement resulting in strains on the plate surface. A coil of optical fiber, made to be part of an optical interferometer, is attached to the flexural disk, the strain from the disk is transferred to the fiber thus changing the path length of the fiber interferometer. The interferometer output in demodulated providing the acceleration response. The design of the accelerometer housing is such that it is highly immune to extraneous signals, i.e., dynamic and hydrostatic pressure.Type: GrantFiled: April 21, 1997Date of Patent: May 11, 1999Assignee: The United States of America as represented by the Secretary of the NavyInventors: Sandeep T. Vohra, Bruce Danver, Alan Tveten, Anthony Dandridge
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Patent number: 5504720Abstract: A plurality of air-backed elongate mandrels are arranged in an planar array such that their longitudinal axes are parallel. A length of a first optical fiber is wound around portions of each mandrel in a first group of the mandrels for exposure to the parameter. The first optical fiber is arranged such that exposing it to the parameter to be sensed causes the length of the first optical fiber to increase and decrease in direct proportion as the parameter increases and decreases. A length of the second optical fiber is wound around a second group of the mandrels for exposure to the parameter. The second optical fiber preferably is arranged such that exposing it to the parameter to be sensed causes the length of the second optical fiber to increase and decrease in inverse proportion as the parameter increases and decreases.Type: GrantFiled: March 20, 1995Date of Patent: April 2, 1996Assignee: Litton Systems, Inc.Inventors: A. Douglas Meyer, Bruce Danver, Emery Moore
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Patent number: 5475216Abstract: A fiber optic sensor is formed by providing a first mandrel section having a first longitudinal slot therein, placing a reference fiber within the slot and winding a sensing fiber around the first mandrel. The sensor includes a second mandrel section having a second longitudinal slot therein and a spacer between the first and second mandrel sections. The sensing fiber and the reference fibers are wound around the spacer, and then the reference fiber is placed in the second longitudinal slot. The sensing fiber is wound around the second mandrel section. The sensor may include additional mandrels and spacers to form additional sections. A plurality of sensing coils may be formed on each mandrel section.Type: GrantFiled: May 22, 1990Date of Patent: December 12, 1995Inventors: Bruce A. Danver, Jeffrey D. Lastofka
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Patent number: 5363342Abstract: An acceleration insensitive interferometric hydrophone sensor having increased sensitivity comprises a rigid cylindrical support mandrel that is coaxial with and between thin walled sense and reference mandrels. Flanges on the reference and support mandrels form air filled cavities above and below optical reference and sense fiber windings, respectively, that are symmetrically wound on associated mandrels. The walls of the sense and reference mandrels are thin so that they both respond to the same incident acoustic wave signal although 180.degree. out-of-phase. A central collar on the support mandrel provides an acceleration insensitive location for making attachment to the hydrophone. In another embodiment, the reference mandrel is much thicker than the sense mandrel and cavities supporting the sense fiber are caused to operate as acoustic impedance mismatches for rendering the reference fiber winding substantially insensitive to and acoustically decoupling it from an incident acoustic pressure wave signal.Type: GrantFiled: April 28, 1988Date of Patent: November 8, 1994Assignee: Litton Systems, Inc.Inventors: Michael R. Layton, A. Douglas Meyer, Bruce A. Danver
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Patent number: 5253222Abstract: An omnidirectional fiber optic hydrophone includes a concentrically-arranged pair of ring-shaped mandrels mounted between planar upper and base members. Each of the rings is formed of inner and outer annular portions separated by an annular void. Optical fibers wound about the outer circumference of the outer annular portion of the outer ring and about the outer circumference of the inner annular portion of the inner ring communicate with a source of optical energy and with a photodetector to provide signals for measuring acoustic wave-induced deflections of the rings. A plurality of mandrels may be employed in a single hydrophone which may be potted with elastomeric material or free flooded.Type: GrantFiled: February 9, 1993Date of Patent: October 12, 1993Assignee: Litton Systems, Inc.Inventors: Bruce A. Danver, A. Douglas Meyer
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Patent number: 5155548Abstract: A mismatched path length fiber optic interferometer is optically coupled to an optical fiber and configured to form an omnidirectional acoustic sensor. A second mismatched path length fiber optic interferometer is optically coupled to the optical fiber and configured as a first gradient sensor. A second fiber optic gradient sensor is also optically coupled to the optical fiber. A detector optically coupled to the omnidirectional acoustic sensor and to the gradient sensors converts optical signals output therefrom to electrical signals indicative of the magnitude and direction of changes in an acoustic field. The omnidirectional acoustic sensor may include a length of optical fiber wrapped around the housing while the gradient sensors are mounted inside the housing. The housing perferably has a volume that is adjustable for controlling the buoyancy thereof. Each gradient sensor preferably comprises a pair of mandrels formed to enclose chambers. Optical fiber coils are formed on the mandrels.Type: GrantFiled: May 22, 1990Date of Patent: October 13, 1992Assignee: Litton Systems, Inc.Inventors: Bruce A. Danver, Jeffrey D. Lastofka, Michael R. Layton