Patents by Inventor Mohammad Taghi Fatehi

Mohammad Taghi Fatehi 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: 7834303
    Abstract: A novel concentrator system is described, which increases the efficiency of collecting sunlight energy and concentrates it on a target. This method uses an array of small movable reflective or refractive concentrator components that can move via a feedback mechanism which tracks the sun and concentrates the suns energy on to a second array of energy converting elements. In order to improve the effective collected energy, the array of concentrator elements is placed on a moving or tiltable flat slab (or dish, substrate, plane, plate, holder, tablet, or similar flat or non-flat surface) that tracks the sun. An alternative method uses an array of target elements or linear elements and a second array of concentrator elements in harmony such that and suns energy is efficiently redistributed by the reflective/reactive array on to the energy converting array as the sun's position in the sky (elevation and azimuth) changes.
    Type: Grant
    Filed: June 9, 2008
    Date of Patent: November 16, 2010
    Assignee: Ahura Energy Concentrating Systems
    Inventors: Mohammad Taghi Fatehi, Fareed Sepehry-Fard
  • Publication number: 20090302199
    Abstract: A novel concentrator system is described, which increases the efficiency of collecting sunlight energy and concentrates it on a target. This method uses an array of small movable reflective or refractive concentrator components that can move via a feedback mechanism which tracks the sun and concentrates the suns energy on to a second array of energy converting elements. In order to improve the effective collected energy, the array of concentrator elements is placed on a moving or tiltable flat slab (or dish, substrate, plane, plate, holder, tablet, or similar flat or non-flat surface) that tracks the sun. An alternative method uses an array of target elements or linear elements and a second array of concentrator elements in harmony such that and suns energy is efficiently redistributed by the reflective/reactive array on to the energy converting array as the sun's position in the sky (elevation and azimuth) changes.
    Type: Application
    Filed: June 9, 2008
    Publication date: December 10, 2009
    Inventors: Fareed Sepehry-Fard, Mohammad Taghi Fatehi
  • Publication number: 20060293613
    Abstract: This application describes a revolutionary device to help prevent the development of pressure ulcers. The device works by using a small number of sensors in the wheelchair or bed to determine and track the projection of the patient's center of gravity (COP) onto the plane of the chair or bed. The sensor data are processed by various algorithms which determine when the danger of pressure ulcer development arises and alerts an attendant to reposition the patient. The repositioning is likewise monitored, and if it is inadequate, a higher-level alarm is issued. This device also maintains a history of patient position and movement, which is potentially useful for diagnostic purposes, such as tracking the degree of improvement resulting from a course of treatment or therapy. The archival record can also provide verification of proper care in the event of lawsuits or insurance claims.
    Type: Application
    Filed: June 27, 2005
    Publication date: December 28, 2006
    Applicant: CONCEPT DEVELOPMENT GROUP
    Inventors: Mohammad Taghi Fatehi, Leslie Baxter
  • Patent number: 6694100
    Abstract: Station apparatus used at a Local Serving Office (LSO) and at one or more stations reduces contention for communication access over time slots and/or wavelengths and/or fibers of an optical facility. The station apparatus enables Space-Wavelength-Time Division Multiple Access (SWT-DMA) communications using a combination of two or more different communication modes selected from a group including (1) a space division multiplexed access (SDMA) mode which selects a fiber(s) of the optical facility, (2) a wavelength division multiplexed access (WDMA) mode which selects a wavelength(s) on a fibers, and (3) a time division multiplexed access (TDMA) mode which selects time slot(s) of a wavelength. Communication mode selection may utilize (1) out-of-band signaling, (2) optical tag signaling, or (3) time marker signaling over a wavelength of one or more of the optical fibers.
    Type: Grant
    Filed: June 5, 2000
    Date of Patent: February 17, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Mohammad Taghi Fatehi, Victor Bernard Lawrence, Kazem Anaraky Sohraby
  • Patent number: 6600583
    Abstract: An optical internet router apparatus uses optical tags to send and receive command and response messages between routers of an optical network for establishing, maintaining or changing a packet data connection over the network between a source router and a destination router. The optical router comprises (1) optical tag apparatus for reading a message and writing a message modulated on one or more wavelengths which are used for communicating with another router of a network connection, the control message being modulated onto the one or more wavelengths using a secondary modulation scheme which is different from a primary modulation used to modulate packet data; and (2) a controller responsive to a received read message for controlling a network connection at this router, and for generating a network control message to be written by the optical tag apparatus, the generated message controlling a network connection to said another router.
    Type: Grant
    Filed: September 28, 1999
    Date of Patent: July 29, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Mohammad Taghi Fatehi, Kazem Anaraky Sohraby
  • Patent number: 6600581
    Abstract: A method is provided for verifying that optical signals are properly routed between inputs and outputs of an optical cross-connect according to the prescribed routing paths defined in the cross-connect map. More specifically, optical signals are independently tagged at the cross-connect input ports with connection verification messages containing identification information. Connection verification messages can include, among other information, a message identification, incoming and outgoing wavelength information, incoming and outgoing port information, a time stamp, user verification data, and so on. At the cross-connect output ports, the messages are retrieved (and optionally removed) from the optical signals so that the identification information from the retrieved messages can be compared to the routing defined in the cross-connect map.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: July 29, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Mohammad Taghi Fatehi, Victor Bernard Lawrence, Kazem Anaraky Sohraby
  • Patent number: 6535313
    Abstract: An optical signal access apparatus responds to variations in network traffic by dynamically assigning the number of wavelengths at originating and terminating optical signal access apparatus. A controller of an optical signal access apparatus monitors network traffic by checking the occupancy level (or other parameters) of data buffers and determines therefrom the number of optical signals that should be allocated to handle the network traffic from those buffers. When the optical signal access apparatus is part of a router it can be used to control traffic at the router as well as on the links between the routers of an optical network.
    Type: Grant
    Filed: October 16, 1998
    Date of Patent: March 18, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Mohammad Taghi Fatehi, Kazem Anaraky Sohraby
  • Patent number: 6519064
    Abstract: A scalable, reconfigurable, and cost-effective add/drop arrangement is provided which enables a wavelength division multiplexed (WDM) system to be upgraded to accommodate new or changing add/drop requirements without disruptions in existing service. The add/drop arrangement is based on a modular architecture wherein one or more modular optical routing devices are coupled in an optical fiber path to facilitate the selective adding/dropping of individual optical channels and to facilitate in-service upgrades without disrupting existing transmissions in the optical fiber path. In an exemplary embodiment, at least two directional optical transfer devices, such as optical circulators, are coupled to a drop path for dropping optical channels from the WDM signal, an add path for receiving optical channels to be added to the WDM signal, and a common path between the directional optical transfer devices.
    Type: Grant
    Filed: June 19, 1999
    Date of Patent: February 11, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Mohammad Taghi Fatehi, Bruce Lee Nelson
  • Patent number: 6512612
    Abstract: An optical router includes a capacity utilization unit which determines a packet capacity utilization level of each of a plurality of wavelengths being received at the optical router and a packet combiner unit which combines packets from the two or more wavelengths onto only one of those wavelengths for transmission from the optical router when the combined determined packet utilization level on the two or more wavelengths is less than a predetermined packet utilization level. According to one feature, the router also determines the destination of the packets on each of the wavelengths and only combines the packets of two or more wavelengths if their packets have the same next-hop router or the same termination router destination.
    Type: Grant
    Filed: June 25, 1999
    Date of Patent: January 28, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Mohammad Taghi Fatehi, Kazem Anaraky Sohraby
  • Patent number: 6317255
    Abstract: Automatic reduction of optical signal power supplied by an upstream network element by a prescribed amount is achieved by capturing and processing reflected optical energy that is generated within the optical fiber path as a result of a downstream fiber cut, open connector, or other potentially hazardous discontinuity. Generally, the power level of the reflected optical signal is detected and measured in the optical fiber path and the optical signal power supplied by the upstream network element is automatically reduced. The optical signal power may either be reduced by an amount corresponding to the measured reflected optical signal power or may be completely shut off until the faulty condition is resolved.
    Type: Grant
    Filed: April 28, 1998
    Date of Patent: November 13, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Mohammad Taghi Fatehi, Bruce Lee Nelson, Kamal Kumar Raychaudhuri
  • Patent number: 6192172
    Abstract: A multi-wavelength optical cross-connect switch architecture incorporates a plurality of wavelength-selective optical cross-connect (WSXC) switch fabrics that receive multi-wavelength input signals distributed by one or more optical slicers and generate multi-wavelength output signals that are combined by a plurality of optical combiners. The WSXC fabrics employ fiber Bragg gratings (FBGs) as wavelength-selective elements. Using this architecture, the number of multi-wavelength channels carried by each WSXC is reduced from the number of channels present in each multi-wavelength input signal. In addition, the wavelength spacing between adjacent channels carried by each WSXC is increased over the spacing between adjacent channels in each multi-wavelength input signal.
    Type: Grant
    Filed: August 9, 1999
    Date of Patent: February 20, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Mohammad Taghi Fatehi, Wayne Harvey Knox
  • Patent number: 6122096
    Abstract: An expandable optical add/drop system according to the present invention includes an optical add/drop multiplexer with an integrated amplification and wavelength-selective fiber path and passive optical couplers for selectively adding and dropping wavelengths from a multi-wavelength signal, such as a wavelength division multiplexed optical signal. One or more fiber gratings are disposed along the length of a rare earth-doped optical fiber or between segments of the rare earth-doped optical fiber so that at least one grating is used for reflecting each optical signal that is to be added to or dropped from the multi-wavelength optical signal. By using this configuration, appropriate amplification is provided to compensate for specific losses in the add, drop, and through paths for existing and future add/drop service.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: September 19, 2000
    Assignee: Lucent Technologies Inc.
    Inventor: Mohammad Taghi Fatehi
  • Patent number: 6122095
    Abstract: A loss-less, optical add/drop multiplexer according to the present invention includes a rare earth-doped fiber amplifier integrated with a wavelength-selective fiber path coupled between two directional optical transfer devices for selectively adding and dropping optical signals from a multi-wavelength signal, such as a wavelength division multiplexed optical signal. One or more fiber gratings are disposed along the length of the rare earth-doped fiber amplifier or between segments of the rare earth-doped fiber so that at least one grating is used for reflecting each optical signal that is expected to be added to or dropped from the multi-wavelength optical signal. By using this configuration, appropriate amplification is provided to compensate for losses in the add, drop, and through paths.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: September 19, 2000
    Assignee: Lucent Technologies Inc.
    Inventor: Mohammad Taghi Fatehi
  • Patent number: 6067389
    Abstract: An optical switch includes an optical router portion for distributing multi-wavelength optical signals received at input ports of the switch, an optical combiner portion for supplying multi-wavelength signals at the output ports of the switch, and optical fibers for interconnecting the optical router portion and optical combiner portion. Selected ones of the interconnecting optical fibers include wavelength-selective elements, such as fiber gratings, which are capable of transmitting or reflecting individual channels within the multi-wavelength optical signal so that a selected channel of a particular wavelength can be routed from any of the input ports to any of the output ports of the switch. In one exemplary embodiment, the optical router portion includes a plurality of input optical couplers, wherein each input optical coupler is associated with a corresponding input port of the optical switch.
    Type: Grant
    Filed: July 27, 1998
    Date of Patent: May 23, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Mohammad Taghi Fatehi, Wayne Harvey Knox
  • Patent number: 6008934
    Abstract: The subject matter is directed to a parallel array of optical amplifiers and is also directed to equally sharing the optical power supplied by a plurality of optical pumps among the array of optical amplifiers such that if one of the pumps fails the power outputted by the remaining pumps is still equally shared among the array of optical amplifiers.
    Type: Grant
    Filed: November 7, 1997
    Date of Patent: December 28, 1999
    Assignee: Lucent Technologies Inc.
    Inventors: Mohammad Taghi Fatehi, Neil Jackman, Andrew Jozan, Virginia Laura Nichols, Sunita H. Patel, Mario Alberto Restrepo, Ravindra K. Vora
  • Patent number: 6002818
    Abstract: A free-space N by M, where N and M>1, optical signal switch (OXC) requires only transmitter beam steering for controlling to which receiver an optical signal from a transmitter is directed. In a preferred embodiment the transmitters handle single mode optical signals and the receivers handle multimode optical signals. The OXC may optionally include a fixed optical unit implemented using either a single fixed shared lens or a plurality of M optical elements for further directing each of the M optical signals to their respective receivers.
    Type: Grant
    Filed: December 5, 1997
    Date of Patent: December 14, 1999
    Assignee: Lucent Technologies Inc
    Inventors: Mohammad Taghi Fatehi, Joseph Earl Ford