Patents Represented by Attorney D. L. Hurewitz
  • Patent number: 5655001
    Abstract: A method and apparatus for offering wireless telecommunication service. A switch such as an automatic Private Branch Exchange (PBX), equipped to communicate with Integrated Services Digital Network (ISDN) stations sends ISDN signaling messages to and receives ISDN signaling messages from a protocol converter. The protocol converter, which also communicates with a wireless cell site, converts messages between the ISDN protocol and a protocol for communicating with the wireless cell site. The cell site sets up wireless connections to a mobile station, essentially in its prior art mode, and the PBX sets up connections to the cell site essentially in its prior art ISDN station control mode. The PBX is connected to a class 5 (central office) telecommunications switching system for establishing connections between the public switched telephone network and the PBX, or between outlets of the PBX for a call between wireless stations.
    Type: Grant
    Filed: October 3, 1994
    Date of Patent: August 5, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: William Keith Cline, James Joseph Fuentes
  • Patent number: 5172259
    Abstract: A network comprising a plurality of successively interconnected node stages where each node has an associated data connection state and includes a control element, significantly implemented as part of the node itself, for controlling the data connection state of at least one node of the following stage. The network is well suited for optical implementation and is controlled by shifting bits into the network for storage by the control elements rather than relying on spatial light modulators.
    Type: Grant
    Filed: February 27, 1991
    Date of Patent: December 15, 1992
    Assignee: AT&T Laboratories
    Inventors: Thomas J. Cloonan, John R. Erickson, Anthony L. Lentine, Frederick B. McCormick, Jr., Gaylord W. Richards
  • Patent number: 3983317
    Abstract: In a laser recording system, a high energy intensity laser beam is focused to form a circular write-spot on a rotating thermoplastic disc. This spot creates tracks of grooves and flat areas or lands in accordance with input data. To read the data from the disc a reduced energy beam is focused on the previously recorded track, and the pattern of grooves and lands is determined from the reflected energy. The optics associated with the reading process include an astigmatizer which elongates the read-spot in a direction transverse to the track. This reduces mechanical tolerances required to insure that the read-spot will impinge upon the desired track. The astigmatizer may also serve to reduce the beam spot energy intensity so that the same laser, without the astigmatizer, can be used for the recording process.In one embodiment, the astigmatizer is a movable plate having a single slit.
    Type: Grant
    Filed: December 9, 1974
    Date of Patent: September 28, 1976
    Assignee: Teletype Corporation
    Inventor: Charles A. Glorioso
  • Patent number: 3961269
    Abstract: A two phase clock signal with separation between the two phases is produced from a single phase clock. Two complementary input signals are derived from the single phase clock and are transferred by separate transfer gates to individual push/pull amplifiers. Each gated input signal is applied to the first input of one of the amplifiers while the complementary input signals are connected directly to the second input of the amplifiers. The output of each push/pull amplifier is one of the clock phases, and each is also applied to a sensing circuit. The sensing circuit produces delayed outputs which are cross-coupled to control the transfer gate associated with the other output phase. By judicious selection of the parameters of the sensing circuit, the time and speed of "turn-on" for each transfer gate can be controlled. Accordingly, the separation between the two clock phases as well as the shape of each can be selected.
    Type: Grant
    Filed: May 22, 1975
    Date of Patent: June 1, 1976
    Assignee: Teletype Corporation
    Inventor: Cesar E. Alvarez, Jr.
  • Patent number: 3952152
    Abstract: A CRT shield comprising a woven metallic mesh screen seam welded to a metal collar which is perforated around its periphery. The collar is fitted over the face of the CRT with an implosion screen and a plastic mounting housing positioned in turn over the face of the screen and then potted with an epoxy resin through the perforations in the collar to form one rigid, bonded structure. A tapered metal shielding is then fitted in overlapping relationship with the collar, and a metal end cap fitted over the neck of the CRT and overlaps the tapered shield in order to completely surround the CRT with metal shield material.
    Type: Grant
    Filed: October 29, 1974
    Date of Patent: April 20, 1976
    Assignee: Teletype Corporation
    Inventors: William B. Lill, Edward M. Rezotko
  • Patent number: 3946245
    Abstract: A field-effect transistor serial inverter circuit is disclosed. Capacitive coupling is provided between the control electrode of a first inverter and the control electrode of a load transistor in a serially connected second inverter. The capacitor thereby couples the input to the load transistor of the second inverter, significantly reducing the transition delay time associated with the two series inverters, and also increasing the voltage level available at the output of the second inverter to substantially the same level as the supply voltage.
    Type: Grant
    Filed: February 12, 1975
    Date of Patent: March 23, 1976
    Assignee: Teletype Corporation
    Inventor: Michael J. McClaughry
  • Patent number: 3944848
    Abstract: A static logic circuit utilizing transistors of the MOSFET type includes a high resistance load transistor, a low resistance logic network having a large self-loading capacitance, and a gating transistor connected in series between the network and the load device. The logic network controls the output voltage across a load capacitor by grounding the load transistor output for selected input data, and the gating transistor is biased to turn OFF when the voltage across the large self-loading capacitance exceeds a predetermined level, thereafter isolating the input network from the load capacitor and speeding up the output transition by decreasing the time required to charge the load capacitor.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: March 16, 1976
    Assignee: Teletype Corporation
    Inventor: Richard H. Heeren
  • Patent number: 3938052
    Abstract: Digital logic apparatus for demodulating a received phase-modulated carrier wave wherein phase-shifts between successive signalling intervals encode data elements. A shift register serially stores periodic samples of a squared version of the received wave. Exclusive-OR gates compare pairs of stored wave samples, each pair comprising a sample from a previous signalling interval and a sample from a current signalling interval. At least one of the exclusive-OR gates derives synchronizing signals for a local timing generator. For each data element, an integrator is associated with one of the exclusive-OR gates to accumulate a count related to the time during which pairs of similar samples are sensed by its exclusive-OR gate during each signalling interval. The integrator registering the highest count at the end of a given data interval signifies the data element received during that interval.
    Type: Grant
    Filed: May 9, 1974
    Date of Patent: February 10, 1976
    Assignee: Teletype Corporation
    Inventors: Jerry M. Glasson, Ira S. King
  • Patent number: 3935386
    Abstract: Digital logic apparatus for synthesizing a phase-modulated carrier wave wherein phase shifts between successive carrier-wave segments encode data elements. Carrier-wave segments having different phases are stored in the form of digitally encoded samples in a memory. A digital-to-analog converter is connected to convert sequentially read samples of selected segments into the phase-modulated carrier wave. A combinational logic circuit selects each segment to be addressed according to an applied data element and the phase of the previously selected segment. Means are provided to overlap and blend successively addressed segments to provide smooth phase transitions in the synthesized wave.
    Type: Grant
    Filed: September 20, 1974
    Date of Patent: January 27, 1976
    Assignee: Teletype Corporation
    Inventors: Jerry Marshall Glasson, Harold Louis Kabb