Patents Assigned to Lucent Technologies Inc. ("Lucent')
  • Patent number: 6181849
    Abstract: The present claimed invention improves on the conventional comb and multiple router approach by making multiple use of a single router by using interleaved groups of wavelengths that enter through different entrance ports and exit through different groups of exit ports of the same router. This permits better separation (lower crosstalk) between adjacent channels, greatly reduced temperature sensitivity, small physical size and lower cost. With these improvements, a large number of wavelength add/drop sites may be cascaded in WAD/WDM systems.
    Type: Grant
    Filed: April 30, 1999
    Date of Patent: January 30, 2001
    Assignee: Lucent Technologies, Inc.
    Inventors: Wenhua Lin, Nathan Myron Denkin
  • Patent number: 6178394
    Abstract: A verification of the protocol between the various communicating elements of a concurrent system may be performed directly using the actual code that implements the element when it is actually operating. This is achieved by combining stateless search techniques with partial order methods, namely, persistent set and sleep set methods. In particular, the code of each element of a system is exercised by a scheduler in such a way that global states of the system are visited according to a stateless search, which is a search that does not use an explicit representation of the global states. A global state is a state in which the next operation to be executed by every element of the system is a visible operation. The set of visible operations includes at least those operations related to communication between the elements.
    Type: Grant
    Filed: December 9, 1996
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies Inc.
    Inventor: Patrice Ismael Godefroid
  • Patent number: 6178088
    Abstract: An electronic apparatus having a heat pipe that is thermally bonded to plates to internal and external enclosures. The electronic apparatus is located in a heat dissipative external enclosure. The electronic apparatus having at least one unit contained in a thermally conductive internal housing providing RF isolation and mounted on a wall of the external enclosure in thermal contact therewith. The electronic apparatus also having a heat pipe having a first plate bonded to its evaporator and a second plate bonded to its condenser, both bonds being thermally conductive. The first plate being mounted by fixings in thermal contact with the internal housing, the second plate being mounted by fixings in thermal contact with the wall of the external enclosure at a position lower, in use, than the first plate. This allows the heat pipe to be easily removed. This also allows the inner housing to maintain RF isolation.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies Inc.
    Inventor: William George Gates
  • Patent number: 6178530
    Abstract: A memory addressing scheme suitable for use for either interleaving or de-interleaving data bytes of, e.g., a broadcast digital television (DTV) data stream. A number of memory branches are configured in a random access memory (RAM), wherein at least some of the branches have different numbers of memory locations for reading out and for storing data bytes, thus defining memory branches of different lengths in the RAM. A start address is determined for each of the memory branches in the RAM, corresponding to a first memory location of each branch. An offset value is determined for each memory branch, to be added to the start address for the branch for addressing a memory location of the branch. If an offset value does not exceed the length of a corresponding branch, an address corresponding to the sum of the branch start address and the offset value is generated for addressing a successive memory location of the branch, and the offset value for the branch is incremented by one.
    Type: Grant
    Filed: April 24, 1998
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Ahmad K. Aman, Hermann J. Weckenbrock
  • Patent number: 6178134
    Abstract: The present invention is directed to an SRAM cell layout having a compact architecture and short local bit-lines. The SRAM cell layout has an improved aspect ratio wherein the vertical dimension of the cell is reduced relative to the horizontal dimension of the cell. The resulting additional horizontal space permits the use of an additional vertical metal channel. The SRAM cell layout uses this additional vertical metal channel to add one or more global bit-lines. With the addition of global bit-lines, the communications between SRAM cells on a SRAM device is not limited to conventional one pair of vertical bit-lines. Therefore, the conventional vertical bit-lines may be segmented into shorter local bit-lines. These local bit-lines have shorter length and have reduced capacitance and resistance. The reduced capacitance and resistance in turn improve the performance of the SRAM device.
    Type: Grant
    Filed: September 21, 1999
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies, Inc.
    Inventors: Donald A. Evans, Ronald J. Wozniak
  • Patent number: 6178019
    Abstract: A system and method for controlling the selectivity function in a holographic memory system that permits more rapid location and retrieval of holographically stored data. The system and method direct a reference beam through a filter such as, for example, an aperture, to bandwidth limit the beam before the beam illuminates a holographic optical element having stored therein a hologram of a reference beam.
    Type: Grant
    Filed: May 3, 1999
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies, Inc.
    Inventor: William Larry Wilson
  • Patent number: 6178461
    Abstract: The amount of information that must be transmitted from an Internet server to a user's computer or workstation when the user requests an Internet object, for example, by clicking on a URL in a web browser application, is reduced using a cache-based compaction technique in which the requested object is encoded in the server using information relating to similar objects that were previously supplied to the user. Similar objects available in both a client side cache and a server side cache are selected by comparing the URL of the requested object to the URL's of stored objects. Differential encoding is performed in the server such that the server transmits to the client information indicative of the differences between the requested object and the reference (similar) objects available in the server cache. A corresponding decoding operation is performed in the client, using the encoded version and reference objects available in the client cache.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Mun-Choon Chan, Thomas Yat Chung Woo
  • Patent number: 6178159
    Abstract: Methods and apparatus for an ATM network for determining an allowed cell rate without the introduction of oscillations by using a average cell rate of all virtual circuits. Each ATM switch may be configured to calculate an allowed cell rate (ACR) for each connection between adjacent ATM switches along the virtual circuit and to relay this information back to a source using a BRM cell.
    Type: Grant
    Filed: March 2, 1998
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Linhai He, Albert Kai-sun Wong
  • Patent number: 6177218
    Abstract: A lithographic process for device fabrication in which a pattern is transferred from a mask into an energy sensitive material by projecting charged particle (e.g. electron beam) radiation onto the mask is disclosed. The pattern on the mask is divided into segments. The radiation transmitted through the mask and incident on the layer of energy sensitive material transfers a continuous image of the segmented mask pattern into the energy sensitive material. The images of each segment are joined together to form the continuous image by seam blending techniques. The seam blending techniques employ duplicate pattern information on segments for which the images are joined together. The image of the duplicate pattern information from a first segment is overlapped with the image of the duplicate pattern information from the second segment to blend the seams together.
    Type: Grant
    Filed: March 15, 1999
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Joseph Allen Felker, James Alexander Liddle, Stuart Thomas Stanton
  • Patent number: 6178098
    Abstract: For use in a power converter having an inverter coupled to an output rectifier, a post-regulator, a method of operating the same and a power converter incorporating the post-regulator or the method. In one embodiment: (1) a switching circuit, having at least one controllable switch and coupled an output of the power converter, that receives an output voltage from the power converter and produces a phase-shifted waveform therefrom and (2) a transformer, having a primary winding coupled to the switching circuit and a secondary winding coupled to the rectifier, that delivers the phase-shifted waveform to the rectifier to regulate the power converter, thereby allowing the inverter to be unregulated.
    Type: Grant
    Filed: September 22, 1999
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Jin He, Mark E. Jacobs
  • Patent number: 6178542
    Abstract: Hardware-software co-synthesis is the process of partitioning an embedded system specification into hardware and software modules to meet performance, power, and cost goals. Embedded systems are generally specified in terms of a set of acyclic task graphs. According to one embodiment of the present invention, a co-synthesis algorithm, called COSYN, starts with periodic task graphs with real-time constraints and produces a low-cost heterogeneous distributed embedded system architecture meeting these constraints. The algorithm has the following features: 1) it allows the use of multiple types of processing elements (PEs) and inter-PE communication links, where the links can take various forms (point-to-point, bus, local area network, etc.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies Inc.
    Inventor: Bharat P. Dave
  • Patent number: 6178237
    Abstract: An arrangement for a teleconferencing bridge allows one or more users to control at least one characteristic of at least some of the input signals received by the bridge, such that the output signals received by each user in a teleconference is a user-controlled combination of all the input signals, including the changed input signals. The arrangement allows a rich set of audio bridging features to be provided cost-effectively. Those features include subconferencing, monitoring, whispering, muting, complex gain control, and pseudo stereo.
    Type: Grant
    Filed: December 24, 1997
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies, Inc.
    Inventor: David N. Horn
  • Patent number: 6177363
    Abstract: A method for forming a gate dielectric for use in ultra-thin integrated circuit environments includes forming a nitride layer under conditions effective to introduce defects in the nitride layer. The nitride layer is formed so as to have a defect density which is sufficiently large to provide a low interfacial trap density, particularly after annealing, and thus eliminate the charge trap problems associated with traditional nitride layers. This nitride layer can be used in, for example, ON or ONO structures, which can themselves be employed as a gate dielectric. The ON and ONO structures are preferably formed under low temperature and low pressure conditions to more effectively control oxide and nitride formation. This allows for the formation of gate dielectrics that are less than 10 nm in thickness. Moreover, these ultra-thin dielectrics can be formed in a single furnace cluster.
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Pradip K. Roy, Yi Ma, Michael A. Laughery
  • Patent number: 6177861
    Abstract: A system provides short range wireless data communication from a central control point (e.g., interrogator) to inexpensive endpoints (e.g., tags). The endpoints utilize the technology of modulated backscatter for transmission from the tags to the interrogator. The system uses a new downlink protocol for data transmission from the interrogator to the tags and a new uplink protocol for data transmission from the tags to the interrogator. Both protocols use a backoff/retry algorithm to randomly retransmit any non-acknowledged messages. System capacity from the tags to the interrogator is further enhanced by the use of uplink subcarrier frequency division multiplexing.
    Type: Grant
    Filed: July 17, 1998
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies, Inc
    Inventors: John Austin MacLellan, R. Anthony Shober
  • Patent number: 6178238
    Abstract: An arrangement for permitting callers to make speed dialing calls away from their home telephone. A speed dialing list is maintained for those who subscribe to this service for a particular telephone line. When the caller who normally uses that line and makes use of his/her speed dialing feature from that line, and is away from his/her telephone, speed dialing service can be obtained if the call is a calling card, or credit/debit card telephone call. Such calls are routed initially to a switch for serving such calls. This switch then queries a calling card or credit card data base to obtain either a number corresponding to the caller's speed calling number, or to obtain an identification of the switch which contains that caller's speed dialing list. The caller is identified by his/her calling card, or credit/debit card number.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Barbara Ann Bozek, James Lee Turner
  • Patent number: 6178284
    Abstract: An optical attenuator is disclosed that utilizes the concept of destructive and constructive interference to enhance the ability to attenuate the light signal sent between an optical transmitter and an optical receiver. Rather than completely blocking out a portion of the light signal or utilizing a membrane coated with a partially reflecting material, the present invention utilizes a very high reflectivity coating on divided surfaces, and controls the relative distances between each of the divided surfaces and the optical transmitter/receiver.
    Type: Grant
    Filed: September 30, 1998
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies, Inc.
    Inventors: Ernest E. Bergmann, Joseph E. Ford, James A. Walker
  • Patent number: 6178234
    Abstract: A telephone calling card (prepaid or postpaid) service system with an intelligent network (IN) for automated call processing has a bailout capability for bailing out a call placed directly to the IN, to an operator for assistance upon the occurrence of predefined contingencies. A service control point (SCP) in the IN interfaces with a switch containing a service switching point (SSP) for switching a call to its destination via the ETSI INAP or ITU INAP protocol. The switch also contains an operator service position system (OSPS), and an originating call processor (OCP) coupled to both the SSP and OSPS. After the occurrence of a bailout condition (resulting from a call being unauthorized as determined by the SCP), the SCP sends a destination routing address to the SSP including a network routing address (NRA) indicating which OSPS to direct the call for eventual operator assistance (via the SSP).
    Type: Grant
    Filed: February 11, 1999
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies, Inc.
    Inventors: Yigang Cai, Shiyan Hua, Wing H. Huen
  • Patent number: 6178167
    Abstract: Improved telecommunication apparatus is realized with a structure that is tailored to provide an ID signal to the telecommunication network, which signal uniquely identifies the apparatus. The ID signal can be communicated to the network under control of the apparatus, or polled by the network. The apparatus includes a second port through which communication services are provided to a customer, and the ID signal can be sent to that second port as well. The apparatus further includes circuitry for processing signals flowing between the two ports, allowing the characteristics of the signal to change and thereby provide for format conversions, encryption, and other capabilities.
    Type: Grant
    Filed: April 4, 1996
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies, Inc.
    Inventor: Alexander Gibson Fraser
  • Patent number: 6178329
    Abstract: The present invention concerns the efficient use of the radio spectrum in wireless communications. Channel occupancy data and channel availability data concerning a specific base station and its neighbors are used to assign frequency channels to mobile units and/or base stations. The channel occupancy and availability data may be located at a base station or at a mobile switching center. Channels are preferably assigned as channel pairs.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: January 23, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Pi-Hui Chao, Chih-Lin I
  • Patent number: 6175748
    Abstract: A booster for amplifying the signal of a mobile unit of a cellular telephone system. The booster includes a level determination device which produces a reference level based on a power level of a signal received from the mobile unit. The level determination device includes a step voltage circuit which produces a step voltage based on the power level of the signal received from the mobile unit. The step voltage is supplied to a resulting voltage circuit which produces a resulting voltage based on the step voltage, the resulting voltage suitably providing a reference level for the booster.
    Type: Grant
    Filed: February 9, 1998
    Date of Patent: January 16, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Joseph C. Aboukhalil, Boris Aleiner, Boris A. Bark