Patents by Inventor Thomas G. Brown

Thomas G. Brown 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).

  • Patent number: 8014069
    Abstract: A stress-induced polarization converter in the form of a zero power optical window or, alternatively, a single element, positive or negative power optical lens, that is subject to a controlled amount of symmetric, peripheral stress. The stress may be provided by appropriate mechanical, thermal, hydraulic, electromagnetic/piezo, annealing/molding, or other known techniques and may be trigonal or four-fold. Axial foci can be created by applying the controlled, symmetric, peripheral stress. The separation distance between the foci can be controlled by controlling the magnitude of the applied symmetric, peripheral stress.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: September 6, 2011
    Assignee: University of Rochester
    Inventors: Alexis K. Spilman, Thomas G. Brown
  • Patent number: 7526158
    Abstract: A system for applications, such as imaging, lithography, data storage, and inspection, includes an optical element, at least one structure, and a source of light. The structure is at least partially in and at least adjacent a surface of the optical element. The source of light has a mode profile that provides an electric field which has a vector component substantially perpendicular to a surface of the optical element. The source of light is positioned to propagate at least a portion of the light through the optical element onto the object. The structure enhances the electric field of the light which optically interacts with the object.
    Type: Grant
    Filed: February 7, 2002
    Date of Patent: April 28, 2009
    Assignee: University of Rochester
    Inventors: Lukas Novotny, Thomas G. Brown
  • Publication number: 20090040602
    Abstract: A stress-induced polarization converter in the form of a zero power optical window or, alternatively, a single element, positive or negative power optical lens, that is subject to a controlled amount of symmetric, peripheral stress. The stress may be provided by appropriate mechanical, thermal, hydraulic, electromagnetic/piezo, annealing/molding, or other known techniques. The applied symmetric stress will advantageously be trigonal or four-fold, but is not so limited. Advantageously, the polarization converter will be exhibit greater than about one wave of retardation and, in a particular advantageous aspect, will exhibit at least two waves of phase retardation. The stressed lens or window will be characterized by a smoothly varying birefringence that, near center, will exhibit substantially circular contours of equal birefringence. When illuminated by circularly polarized light, the polarization converter will produce concentric rings of alternating right and left circular polarization.
    Type: Application
    Filed: June 20, 2008
    Publication date: February 12, 2009
    Applicant: University of Rochester
    Inventors: Alexis K. Spilman, Thomas G. Brown
  • Patent number: 7414786
    Abstract: A system for converting the polarization state of an optical beam which propagates along a path from an initial polarization state into an inhomogeneous polarization state includes a first isotropic material and a first anisotropic material. The first anisotropic material is positioned adjacent to the first isotropic material in a substantially transverse manner relative to the path of the optical beam. The first anisotropic material has a first alignment axis that produces one of a radially, azimuthally, and counter-rotationally polarized optical beam when substantially aligned with respect to a polarization axis of the optical beam.
    Type: Grant
    Filed: January 12, 2005
    Date of Patent: August 19, 2008
    Assignee: University of Rochester
    Inventors: Thomas G. Brown, David P. Biss
  • Patent number: 7187835
    Abstract: An optical filter includes a dielectric waveguide layer, supporting waveguide modes at specific wavelengths and receiving incident light, a corrugated film layer, composed of one of a metal and a semiconductor and positioned adjacent to a second surface of the waveguide layer and a sensor layer, wherein the sensor layer is capable of absorbing optical energy and generating a corresponding electrical signal. The metal film layer supports a plurality of plasmons, the plurality of plasmons producing a first field and is excited by a transverse mode of the waveguide modes at a wavelength interval. The first field penetrates the sensor layer and the sensor layer generates an electrical signal corresponding to an intensity of received incident light within the wavelength interval.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: March 6, 2007
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Margaret Tuma, Thomas G. Brown, Russell Gruhlke
  • Patent number: 7151632
    Abstract: An apparatus for producing an inhomogeneously polarized optical beam from a homogeneously polarized input optical beam includes a first phase shifter, a second phase shifter, and one or more polarization beam splitters. The first phase shifter shifts at least one portion of a first part of the input optical beam by a first phase. The second phase shifter shifts at least one portion of a second part of the input optical beam by substantially the first phase. The one or more polarization beam splitters split the input optical beam into the first part and the second part and combine the phase shifted portion and substantially all other portions of the first part of the input optical beam with the phase shifted portion and substantially all other portions of the second part of the input optical beam to produce the inhomogeneously polarized optical beam.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: December 19, 2006
    Assignee: University of Rochester
    Inventors: David P. Biss, Thomas G. Brown, Kathleen S. Youngworth
  • Patent number: 7022392
    Abstract: An optically recorded article comprising a pattern of isomerized material in two isomeric forms in a matrix, wherein one of the isomeric forms is capable of being converted to the other form by one-electron oxidation and wherein said matrix was polymerized in-situ.
    Type: Grant
    Filed: November 4, 2003
    Date of Patent: April 4, 2006
    Assignee: Eastman Kodak Company
    Inventors: Joseph P. Dinnocenzo, Douglas R. Robello, Samir Y. Farid, Mark R. Mis, Lorraine Ferrar, Aaron S. Peer, Thomas G. Brown
  • Publication number: 20030002834
    Abstract: An optical waveguide is provided. Specifically, a low loss isotopic optical waveguide that comprises a core region having a first refractive index profile by virtue of comprising a first mixture of isotopes of at least one element, and a cladding region having a second refractive index by virtue of comprising a second mixture of isotopes of said at least one element, is provided. Preferably said at least one element comprises silicon and/or oxygen. The optical waveguide may further include germania dopant in the core. A method of preparing the optical waveguide of the present invention is also provided.
    Type: Application
    Filed: February 5, 2002
    Publication date: January 2, 2003
    Inventors: Thomas G. Brown, Bland A. Painter
  • Publication number: 20020114567
    Abstract: A system for applications, such as imaging, lithography, data storage, and inspection, includes an optical element, at least one structure, and a source of light. The structure is at least partially in and at least adjacent a surface of the optical element. The source of light has a mode profile that provides an electric field which has a vector component substantially perpendicular to a surface of the optical element. The source of light is positioned to propagate at least a portion of the light through the optical element onto the object. The structure enhances the electric field of the light which optically interacts with the object.
    Type: Application
    Filed: February 7, 2002
    Publication date: August 22, 2002
    Inventors: Lukas Novotny, Thomas G. Brown
  • Patent number: 5917195
    Abstract: A structure of periodically varying density is provided, that acts as a phonon resonator for phonons capable of participating in phonon-electron interactions. Specifically, a phonon resonator that is resonant for phonons of appropriate momentum to participate in indirect radiative transitions and/or inter zone intervalley scattering events is provided. Preferably, the structure is an isotope superlattice, most preferably of silicon. The structure of the present invention has improved optical, electrical, and/or heat transfer properties. A method of preparing a the structure of the present invention is also provided.
    Type: Grant
    Filed: February 17, 1995
    Date of Patent: June 29, 1999
    Assignee: B.A. Painter, III
    Inventor: Thomas G. Brown
  • Patent number: 5625729
    Abstract: An optoelectronic device for coupling between an external optical wave and a local optical wave. The local wave is supported by a multiplicity of electrodes and a structure associated with the electrodes. The electrodes are spaced in a substantially regular pattern and are adapted for two functions. First, the electrodes resonantly couple between the external wave and the local wave. Second, the electrodes allow a potential difference between adjacent electrodes.
    Type: Grant
    Filed: August 12, 1994
    Date of Patent: April 29, 1997
    Inventor: Thomas G. Brown
  • Patent number: 5520584
    Abstract: A removable flexible chain cover assembly for enclosing the drivetrain of a bicycle during storage and transport and protecting the surroundings from contact with the grease and dirt and sharp components of the drivetrain.
    Type: Grant
    Filed: November 17, 1994
    Date of Patent: May 28, 1996
    Assignee: Thomas G. Brown, III
    Inventor: Thomas G. Brown, III
  • Patent number: 5345624
    Abstract: A shower curtain support arm which mounts on a shower rod without inhibiting the sliding movement of the curtain, and when locked in position controls the position of the shower curtain to hold the curtain away from a bather.
    Type: Grant
    Filed: March 15, 1993
    Date of Patent: September 13, 1994
    Assignee: Thomas G. Brown, III
    Inventor: Thomas G. Brown, III
  • Patent number: 5014206
    Abstract: A system used for determining and recording the location of a vehicle during the occurence of predetermined events. The vehicle is equipped with a sensor or sensors which respond to the occurrence of the predetermined events. The sensors are connected to a navigational system which receive positional information from a navigational transmitter. The navigational system then computes the positional information, such as latitude and longitude of the vehicle, and stores this information in a data collector on the vehicle. The date and time of day of the occurrence of the events may also be stored along with the positional information.
    Type: Grant
    Filed: August 22, 1988
    Date of Patent: May 7, 1991
    Assignee: FaciliTech International Incorporated
    Inventors: James R. Scribner, Raymond J. Nicholson, Thomas G. Brown, Anthony Caracciolo, Jr.
  • Patent number: 4827318
    Abstract: An efficient solid state light emitting device wherein sulphur is used to provide isoelectronic centers in silicon which bind excitons which emit light at a wavelength of 1.32 microns (um) and are particularly adapted for use in integrated opto-electronic circuits and in launching optical signals in single mode optical fibers.
    Type: Grant
    Filed: June 30, 1986
    Date of Patent: May 2, 1989
    Assignee: The University of Rochester
    Inventors: Dennis G. Hall, Thomas G. Brown
  • Patent number: 4688026
    Abstract: Tags capable of wirelessly transmitting unique codes when energized by radio frequency (RF) energy are used to identify a variety of different locations and objects. A portable battery-powered unit having digital storage capabilities is designed to be transported to the general location of the tagged locations and objects. The user moves an RF antenna sufficiently close to the tag to energize it and cause the tag to transmit its code. The detected code is then stored in digital form in a memory. The location tags contain an association or master list of the objects associated with that particular location. The method finds particular utility in performing inventory control of furniture or other objects since the tags can be mounted at points thereon that are not readily observable, thereby preserving their aesthetic appearance.
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: August 18, 1987
    Inventors: James R. Scribner, Thomas G. Brown, Anthony Caracciolo, Jr.
  • Patent number: 4177558
    Abstract: A cutter for trimming plastic pipe which has been roughed in with an end projecting through an opening in a floor so that the trimmed end is in fixed relation, above or below, the surface of the floor. The cutter comprises a housing with its lower end riding on the surface of the floor, an internal saw with its cutting edge in a plane parallel to the surface of the floor received within the pipe end adjacent one side of the pipe and vertically adjustable to establish the level of cutting, and internal guide fingers exerting a thrust on the side of the pipe opposite the saw and adjustable to move the housing sufficiently to force the saw through the wall of the pipe end after which the fingers guide further rotation of the housing about the axis of the pipe end to complete the cut.
    Type: Grant
    Filed: March 3, 1978
    Date of Patent: December 11, 1979
    Assignee: Reed Manufacturing Company
    Inventor: Thomas G. Brown