Patents Represented by Attorney, Agent or Law Firm Antonio R. Durando
  • Patent number: 8351048
    Abstract: A phase-difference sensor measures the spatially resolved difference in phase between orthogonally polarized reference and test wavefronts. The sensor is constructed as a linear-carrier phase-mask aligned to and imaged on a linear-carrier detector array. Mireau and Fizeau polarization interferometric objectives are implemented with a thin conductive wire grid optically coupled to the objective beam splitter.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: January 8, 2013
    Assignee: 4D Technology Corporation
    Inventor: James E. Millerd
  • Patent number: 8345258
    Abstract: An optical device for characterizing a test surface combines a Fizeau interferometer with a polarization frequency-shifting element. Two substantially collinear, orthogonally polarized beams having respective frequencies differing by a predetermined frequency shift are generated by the polarization frequency-shifting element and projected into the Fizeau optical cavity to produce a pair of test beams and a pair of reference beams, wherein the beams in each pair have orthogonal polarization states and have frequencies differing by the predetermined frequency shift. A second, substantially equal frequency shift is introduced in the Fizeau cavity on either one of the pairs of test and reference beams, thereby generating a four-beam collinear output that produces an interferogram without tilt or short-coherence light. The invention may also be implemented by reversing the order of the Fizeau cavity and the polarization frequency-shifting element in the optical train.
    Type: Grant
    Filed: February 6, 2010
    Date of Patent: January 1, 2013
    Assignee: 4 D Technology Corporation
    Inventors: James E. Millerd, Michael North-Morris
  • Patent number: 8275573
    Abstract: An adaptive algorithm is tailored to fit the local fringe frequency of single-frame spatial-carrier data under analysis. Each set of data points used sequentially by the algorithm is first processed with a Fourier Transform to find the local frequency of the fringes being analyzed. That information is then used to adapt the algorithm to the correct phase step thus calculated, thereby optimizing the efficiency and precision with which the algorithm profiles the local surface area. As a result, defects are identified and measured with precision even when the slope of the surface varies locally to the point where the algorithm without adaptive modification would not be effective to measure them. Once so identified, the defects may be measured again locally with greater accuracy by conventional temporal PSI.
    Type: Grant
    Filed: November 23, 2009
    Date of Patent: September 25, 2012
    Assignee: Bruker Nano, Inc.
    Inventors: Joanna Schmit, Florin Munteanu
  • Patent number: 8270067
    Abstract: A DPSK demodulator is implemented in Sagnac interferometer configuration with a delay line element introduced in one or both of the optical paths of the transmitted and reflected beams. Because the two reflected and transmitted beams travel on the same optical path (though in opposite directions), the Sagnac interferometer provides all the advantages of a common-path interferometer, is thermally and mechanically stable, and the phase requirements are greatly reduced. In its simplest form, the Sagnac DPSK demodulator. In the preferred embodiment, the beam-splitting surface and one of the mirrors are combined into a rhomb beam-splitter structure and the other two mirrors into a right-angle prism. In a DQPSK embodiment, the input beam is split by an upfront beam splitter into two parallel beams that are then directed toward the rhomb-beam-splitter/right-angle-prism combination of the invention.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: September 18, 2012
    Assignee: Optoplex Corporation
    Inventors: Yung-Chieh Hsieh, Chiayu Ai
  • Patent number: 8264764
    Abstract: A switchable free-spectral-range mode selector is used to change the free spectral range of a free-space delay-line interferometer. The mode selector consists of a rotatable device with at least one transparent plate selected to produce the desired change in the free spectral range of the delay-line interferometer. The device may be rotated in and out of the free-space optical path of on of the interferometer arms. If used as a DPSK demodulator, the device enables operation at multiple predetermined free spectral ranges. In the preferred embodiment, the demodulator includes a 50/50 beam-splitter cube combined with two cavities. The mode selector consists of a plurality of different transparent slabs attached to a rotatable shaft so that any one of the slabs or none may be inserted in the appropriate optical path to obtain the desired FSR mode of operation.
    Type: Grant
    Filed: August 15, 2011
    Date of Patent: September 11, 2012
    Assignee: Optoplex Corporation
    Inventor: Yung-Chieh Hsieh
  • Patent number: 8213021
    Abstract: Correction factors for the ALR and PTR parameters of magnetic-head sliders are determined by calculating an effective reflectivity and a corresponding PCOR at each pixel of the air-bearing surface. The absolute value of reflectivity at each pixel of the AlTiC air-bearing surface is obtained from an empirical equation relating it to modulation. The ratio of Al2O3 and TiC in the AlTiC surface is then calculated at every pixel assuming a linear relationship between the absolute value of AlTiC reflectivity and the theoretical reflectivity of each constituent. The linear relationship is then also used to calculate the effective (complex) reflectivity for the AlTiC material from the relative concentrations of Al2O3 and TiC at each pixel.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: July 3, 2012
    Assignee: Veeco Metrology, Inc.
    Inventors: Dong Chen, Florin Munteanu, Erik Novak, G. Lawrence Best
  • Patent number: 8196378
    Abstract: A horse boot (10) includes a shell (12) and a gaiter (22). The shell has a sole (14) and an upper (16) with a vertical slit (18). The gaiter (22) is releasably attached to the heel of the upper and is wrapped around the pastern (P) above the hoofs hairline (C) and below the fetlock to anchor the shell to the pastern and function as a barrier against debris. The gaiter includes a portion of two-way stretch material (60) that makes it possible to fold it out of the way for ease of installation. The process is further facilitated by the slit (18) that allows spreading of the shell. By shaping the upper (16) so that it presses against the hoof (H) the boot is advantageously held in place using only the gaiter anchored to the heel of the boot and strapped to the pastern of the horse.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: June 12, 2012
    Assignee: Easycare, Inc.
    Inventor: Garrett N. Ford
  • Patent number: 8174756
    Abstract: Rhomb beam splitters are used to implement various optical demodulators, in particular PSK and DPSK demodulators. The parallel beam-splitting and reflective surfaces of the rhomb structure produce reflection and transmission beams that exit the beam splitter parallel to one another and with a relative phase shift determined by the distance between the surfaces. These features afford the advantages of low cost, compactness, easily tunable, and temperature-insensitive optical structures for constructing a variety of optical demodulators.
    Type: Grant
    Filed: November 1, 2011
    Date of Patent: May 8, 2012
    Assignee: Optoplex Corporation
    Inventor: Yung-Chieh Hsieh
  • Patent number: 8151545
    Abstract: A horse boot has a sole that includes a dome portion designed to conform to the frog and sole of a horse's hoof when no pressure is exerted on it. The dome provides a support surface for the frog and hoof sole when the boot is off the ground and it resiliently deforms downward, thereby allowing the frog and hoof sole to deform naturally, when the boot presses against the ground. As a result, the hoof's frog and sole are always supported in resilient manner while allowed to move as needed for their natural function. The pressure exerted by the ground against the edges of the sole of the boot and the simultaneous counter-pressure exerted by the hoof cause the dome in the boot's sole to flatten, thereby slightly increasing its size to accommodate the natural deformation of the hoof.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: April 10, 2012
    Assignee: Easycare, Inc.
    Inventors: Garrett N. Ford, Pete Ramey
  • Patent number: 8151546
    Abstract: A horse boot includes the combination of an inner liner (10 and 10?) and an outer shell (12). The liner is adapted to wrap around the front and lateral surfaces of the hoof of the horse, while the shell includes an upper (16) designed to conform with the exterior surface of the liner for attachment to it. The shell is fastened to the liner by some detachable means, such as nuts (22) and bolts (20), and the liner/shell assembly is glued to the hoof. The shell may then be removed at will to allow the hoof to be barefoot and may be re-installed to produce a boot in place when desired.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: April 10, 2012
    Assignee: Easycare, Inc.
    Inventor: Garrett N. Ford
  • Patent number: 8111450
    Abstract: Rhomb beam splitters are used to implement various optical demodulators, in particular PSK and DPSK demodulators. The parallel beam-splitting and reflective surfaces of the rhomb structure produce reflection and transmission beams that exit the beam splitter parallel to one another and with a relative phase shift determined by the distance between the surfaces. These features afford the advantages of low cost, compactness, easily tunable, and temperature-insensitive optical structures for constructing a variety of optical demodulators.
    Type: Grant
    Filed: August 8, 2009
    Date of Patent: February 7, 2012
    Assignee: Optoplex Corporation
    Inventor: Yung-Chieh Hsieh
  • Patent number: 8070455
    Abstract: A primary scotch yoke and a secondary scotch yoke are coupled in opposing arrangement and rigidly attached to a linearly reciprocating element. Each scotch yoke includes a rotary actuator with a cam follower and a yoke attached to the reciprocating element. Each yoke has a cam with an open gap through which the follower may be disengaged from the cam and stopped to an idle position. The follower of the secondary scotch yoke is kept idle in a position similarly disengaged from its cam. A controller detects a failure in the primary scotch yoke, disengages the cam follower of the primary yoke from its cam, and energizes the secondary scotch yoke, thereby causing its cam follower to engage its yoke and continue to provide uninterrupted motion to the reciprocating element, in particular the portable pneumatic pump driving an artificial heart.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: December 6, 2011
    Assignee: Syngardia Systems, Inc,.
    Inventor: Frank A. Tinker
  • Patent number: 8072610
    Abstract: The conventional two plates with beamsplitter of the Mirau interferometer are replaced with two achromatic ?/4 retarders. The upper surface of the second retarder is coated with a 50 percent reflecting film, so that it also functions as a beamsplitter. The objective is illuminated with a linearly polarized beam. As a result of this arrangement, the test and reference beam emerging from the Mirau interferometer are orthogonally polarized beams suitable for achromatic phase shifting, thereby facilitating the use of the Mirau interferometer for monochromatic to broadband phase-shifting interference microscopy. Alternatively, it can be used for equalization of beams intensity by placing a rotatable polarizer at the exit of the objective.
    Type: Grant
    Filed: July 1, 2008
    Date of Patent: December 6, 2011
    Assignee: Bruker Nano, Inc.
    Inventors: Joanna Schmit, Parameswaran Hariharan
  • Patent number: 8021422
    Abstract: A pneumatic pump comprises two coaxial cylindrical pumping chambers, each enclosing a piston connected to the other through a partition by a tube, thereby forming a monolithic piston assembly that is driven axially by a common electrical actuator providing reciprocating motion. The volume in the bottom chamber is selected as needed to provide the desired pressure in the left ventricle of an artificial heart driven by the pump. The diameter of the tube connecting the pistons is selected such that the stroke volume of the top chamber is reduced with respect to that of the bottom chamber as needed to match the reduced pressure requirements of the right ventricle of the artificial heart. Check valves are used in each chamber to ensure venting of excess pressure during the blood ejection phase and to limit the vacuum during the fill phase.
    Type: Grant
    Filed: May 18, 2009
    Date of Patent: September 20, 2011
    Assignee: Syncardia Systems, Inc.
    Inventor: Frank A. Tinker
  • Patent number: 8004749
    Abstract: A rhomb beam splitter, rather than a conventional cube, is used in combination with a mirror reflecting both the reflected and transmitted beams to obtain a delay-line interferometer demodulator with a substantially common path. This significantly reduces the sensitivity of the device to environmental changes and also greatly simplifies the manufacture process. A polarization-insensitive coating or a wave plate, a thermal phase tuner with a micro-heater, and two compensator plates are used in the paths of the beams to balance the optical path lengths and to compensate for polarization and environmental effects.
    Type: Grant
    Filed: July 18, 2009
    Date of Patent: August 23, 2011
    Assignee: Optoplex Corporation
    Inventors: Yung-Chieh Hsieh, Chiayu Al
  • Patent number: 8004750
    Abstract: A switchable free-spectral-range mode selector is used to change the free spectral range of a free-space delay-line interferometer. The mode selector consists of a rotatable device with at least one transparent plate selected to produce the desired change in the free spectral range of the delay-line interferometer. The device may be rotated in and out of the free-space optical path of on of the interferometer arms. If used as a DPSK demodulator, the device enables operation at multiple predetermined free spectral ranges. In the preferred embodiment, the demodulator includes a 50/50 beam-splitter cube combined with two cavities. The mode selector consists of a plurality of different transparent slabs attached to a rotatable shaft so that any one of the slabs or none may be inserted in the appropriate optical path to obtain the desired FSR mode of operation.
    Type: Grant
    Filed: August 14, 2009
    Date of Patent: August 23, 2011
    Assignee: Optoplex Corporation
    Inventor: Yung-Chieh Hsieh
  • Patent number: 7961316
    Abstract: An optical spectrum analyzer is implemented with a detector combined with a tunable filter mounted on a stage capable of 360-degree rotation at a constant velocity. Because of the constant rate of angular change, different portions of the input spectrum are detected at each increment of time as a function of filter position, which can be easily measured with an encoder for synchronization purposes. The unidirectional motion of the mirror permits operation at very high speeds with great mechanical reliability. The same improvements may be obtained using a diffraction grating or a prism, in which case the detector or an intervening mirror may be rotated instead of the grating or prism.
    Type: Grant
    Filed: June 7, 2007
    Date of Patent: June 14, 2011
    Assignee: Optoplex Corporation
    Inventors: Yung-Chieh Hsieh, Chiayu Ai
  • Patent number: D652178
    Type: Grant
    Filed: February 12, 2011
    Date of Patent: January 10, 2012
    Assignee: Easycare, Inc.
    Inventor: Garrett N. Ford
  • Patent number: D671693
    Type: Grant
    Filed: January 5, 2012
    Date of Patent: November 27, 2012
    Assignee: Easycare, Inc.
    Inventor: Garrett N. Ford
  • Patent number: D671694
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: November 27, 2012
    Assignee: Easycare, Inc.
    Inventor: Garrett N. Ford