Patents Assigned to American Telephone and Telegraph Company AT&T Bell Laboratories
  • Patent number: 4898446
    Abstract: Disclosed is an optical fiber connector useful for high density arrays. A locking collar is mounted near the rearward portion of a fiber ferrule. The collar includes tabs which engage holes in the connector sleeve when the ferrule is inserted therein. The fiber can be inserted and removed by a tool which depresses the tabs. Space is conserved since the locking mechanism is located entirely within the sleeve.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: February 6, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventor: Roger L. Hinckley
  • Patent number: 4899335
    Abstract: A network architecture of the sort-then-expand type for routing packets including destination information is disclosed. The network includes a distribution stage comprising a plurality of input sorts units, an intermediate stage comprising a plurality of intermediate sort units and an output stage comprising a plurality of output switches. The input sort units each distribute a plurality of packets to the intermediate sort units such that each intermediate sort unit receives approximately the same number of packets destined for each output switch as the other intermediate sort units. Each intermediate sort unit identifies packet groups for a common output switch and connects the groups to the destination output switch. Each destination output switch merges the received groups of packets and distributes them to output ports.
    Type: Grant
    Filed: December 21, 1988
    Date of Patent: February 6, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: James M. Johnson, Jr., Ronald A. Spanke
  • Patent number: 4899373
    Abstract: Personalized telephone features are made available to subscribers away from their home base. A nationally accessible data base system stores feature data in association with personal identification numbers. A subscriber wishing to use personalized features while away from the home base dials a special code from a station connected to any exchange which has access to the data base and presents the personal identification number. The corresponding feature data is retrieved from the data base and stored in the exchange in association with the station from which the request was initiated and telephone service will be rendered in that exchange with the subscriber's personalized telephone features. A temporary office arrangement may be established in which the personalized features will be immediately available on incoming and outgoing calls for a period of time specified by the subscriber. In one embodiment the feature data is stored on a credit card and transmitted to the exchange by a card reader.
    Type: Grant
    Filed: November 28, 1986
    Date of Patent: February 6, 1990
    Assignee: American Telephone and Telegraph Company AT&T Bell Laboratories
    Inventors: Chinmei C. Lee, Stephen A. McGaw
  • Patent number: 4899333
    Abstract: A high capacity metropolitan area network (MAN) is described. Data traffic from users is connected to data concentrators at the edge of the network, and is transmitted over fiber optic data links to a hub where the data is switched. The hub includes a plurality of data switching modules, each having a control means, and each connected to a distributed control space division switch. Advantageously, the data switching modules, whose inputs are connected to the concentrators, perform all checking and routing functions, while the 1024.times.1024 maximum size space division switch, whose outputs are connected to the concentrators, provides a large fan-out distribution network for reaching many concentrators from each data switching module.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: February 6, 1990
    Assignee: American Telephone and Telegraph Company AT&T Bell Laboratories
    Inventor: Gary A. Roediger
  • Patent number: 4899375
    Abstract: A method and apparatus for processing operator assistance calls with minimum expenditure of operator work time. For collect and person-to-person calls, a first operator at a first operator position determines the type of call and, optionally, the name(s) of the calling and called parties. These are recorded in the memory of a program controlled processor system for controlling an operator assistance switching system. The first operator then disconnects from the call while the call is being set up and the call party being alerted. When the called party answers, a second operator position and second operator, having a display of the call information previously recorded, are unattached to the call to determine whether a connection between the calling and called parties should be established and, if so, to cause that connection to be so established.
    Type: Grant
    Filed: September 23, 1988
    Date of Patent: February 6, 1990
    Assignees: American Telephone & Telegraph Company, AT&T Bell Laboratories, American Telephone & Telegraph Company
    Inventors: Thomas M. Bauer, Richard W. Hemmeter, Robert Petrelli, Richard J. Piereth, Cyrenus M. Rubald
  • Patent number: 4896938
    Abstract: Disclosed is an optical fiber connector that comprises two right circular glass tubular cylinders, means for maintaining the cylinders in substantially fixed relative radial relation, and means for maintaining the cylinders in substantially fixed relative axial relation. The fiber ends that are to be connected are maintained in the bores of the respective glass cylinders by UV-curable adhesive means. Connectors according to the invention can have very low insertion loss, are easily field-installed, can be easily and inexpensively manufactured, and are useful for single mode as well as for multimode fiber applications.
    Type: Grant
    Filed: February 27, 1989
    Date of Patent: January 30, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Terry D. Mathis, Calvin M. Miller
  • Patent number: 4897866
    Abstract: An arrangement for allowing a subscriber to select telephone features from the subscriber terminal is disclosed. The subscriber terminal includes a touch screen display and a customer premises computer. The terminal in response to a touching of the appropriate area of the screen, displays a list of all possible telephone features available to this subscriber terminal together with an indication of currently subscribed features. By touching the screen in the appropriate areas, the subscriber may select features to be added or deleted. The information regarding the subscriber selection is transmitted to the central office to which the terminal is connected. The central office maintains a set of software packages corresponding to each of the possible combinations of features to be selected by a subscriber and in response to information from the terminal defining a new set of features, the central office transmits the appropriate software package to the terminal.
    Type: Grant
    Filed: October 19, 1988
    Date of Patent: January 30, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Bhairav A. Majmudar, Vinh T. Vu
  • Patent number: 4897361
    Abstract: When high-vacuum methods are used in the manufacture of miniaturized devices such as, e.g., semiconductor integrated-circuit devices, device layers on a substrate are preferably patterned without breaking of the vacuum. Preferred patterning involves deposition of a semiconductor mask layer, generation of the pattern in the mask layer by ion deflected-beam writing, and transfer of the pattern by dry etching. When the mask layer is an epitaxial layer, further epitaxial layer deposition after patterning may proceed without removal of remaining mask layer material.
    Type: Grant
    Filed: December 14, 1987
    Date of Patent: January 30, 1990
    Assignee: American Telephone & Telegraph Company, AT&T Bell Laboratories
    Inventors: Lloyd R. Harriott, Morton B. Panish, Henryk Temkin
  • Patent number: 4897867
    Abstract: A method and an arrangement are disclosed for forwarding a customer order received from a requesting customer line to a vendor data link. For use with a telecommunications switching system, the order entry arrangement includes a customer signal receiver for receiving customer signals from a requesting customer line and a processor for sending the orders received from the receiver to the vendor data link. The processor normally controls the operation of the switching network of the switching system but also sends received customer orders and the identity of the requesting line to a vendor data link in response to a customer entered order entry request code. Optional vendor identification information may be entered by the customer for selecting a desired vendor. Customer identification information may also be entered by the customer for billing and order security purposes. After the order is received, the order entry arrangement returns an order confirmation signal to the requesting line.
    Type: Grant
    Filed: March 15, 1988
    Date of Patent: January 30, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Robert W. Foster, Charles B. Hirschman, Marie L. Todd
  • Patent number: 4897874
    Abstract: A high capacity metropolitan area network (MAN) is described. Data traffic from users is connected to data concentrators at the edge of the network, and is transmitted over fiber optic data links to a hub where the data is switched. The hub includes a plurality of data switching modules, each having a control means, and each connected to a distributed control space division switch. Advantageously, the data switching modules, whose inputs are connected to the concentrators, perform all checking and routing functions, while the 1024.times.1024 maximum size space division switch, whose outputs are connected to the concentrators, provides a large fan-out distribution network for reaching many concentrators from each data switching module.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: January 30, 1990
    Assignee: American Telephone and Telegraph Company AT&T Bell Laboratories
    Inventors: William P. Lidinsky, Gary A. Roediger, Scott B. Steele, Ronald C. Weddige, Bruce R. Zelle
  • Patent number: 4896940
    Abstract: An optical fiber cable (20) which may be used in a high temperature environment for a substantial period of time without degradation of transmission includes an optical fiber core (22) which is enclosed by an inner tubular member (32) having suitable temperature resistant properties. A braided metallic outer tubular member (50) encloses the inner tubular member and provides suitable mechanical protection and strength for the cable. The integrity of the cable and its performance is further enhanced by a corrugated metallic tube having a sealed periphery and being interposed between the inner and outer tubular members to prevent the ingress of liquid contaminants and to provide the cable with flexibility.
    Type: Grant
    Filed: February 10, 1989
    Date of Patent: January 30, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Krishnaswamy Kathiresan, Parbhubhai D. Patel, Manuel R. Santana
  • Patent number: 4896937
    Abstract: A precisely aligned optical fiber switch assembly. A base member has a vee groove for supporting a fixed optical fiber and a second optical fiber in optical alignment with the fixed fiber. The groove contains sections of different dimensions that receive and align sheathed portions of the fibers and groove sections that receive and align unsheathed portions of the fibers. First aligning means on the base member longitudinally position the fixed and second fibers in the groove. Covering means mate with the base member for covering at least part of the sheathed portions of the fibers. Aligning means position the covering means precisely with respect to the base member.
    Type: Grant
    Filed: August 2, 1988
    Date of Patent: January 30, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Richard T. Kraetsch, Richard J. Pimpinella, Leonard W. Schaper, King L. Tai
  • Patent number: 4896108
    Abstract: A test circuit is described for measuring the specific contact resistivity r.sub.c of self-aligned electrodes contacting underlying diffused regions at a major surface of an underlying semiconductor wafer, as well as the sheet (lateral) resistance r.sub.s of the underlying diffused regions in some embodiments. The test circuit illustratively includes a pair of test MOS or other type of transistors advantageously made by a self-aligned metallization process simultaneously with the other MOS or other type of transistors to be tested. The two test transistors share a common diffused region, a self-aligned common controlled electrode contacting a diffused region underneath it, and a common control electrode. During test operation, both est transistors are kept ON by means of an applied above-threshold control voltage, while a current source forces current through one of the transistors.
    Type: Grant
    Filed: July 25, 1988
    Date of Patent: January 23, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: William T. Lynch, Kwok K. Ng
  • Patent number: 4896346
    Abstract: A password controlled switching system and method of operation for enrolling and storing passwords identifying lines and trunks of the switching system denied access thereto by other lines and trunks and which is operable upon a match of a calling party command with an enrolled and stored password for selectively interconnecting the calling party via a line with ones of the restricted lines and trunks.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: January 23, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: William R. Belfield, William J. Erwin, Thomas J. Geers, Jr., Roy V. Grubbe, Stephen W. Handy, Robert J. Perdue
  • Patent number: 4895813
    Abstract: A new method for fabricating devices which include multicomponent metal halide glasses, e.g., multicomponent metal halide glass optical fibers, is disclosed. In accordance with the inventive method, a multicomponent metal halide glass body, essentially free of crystallites, is produced by cooling essentially every portion of a melt incorporated into the glass body at a quench rate which is necessarily greater than or equal to about 10 Kelvins per second (K/sec). This necessary quench rate is achieved by successively quenching relatively small portions of the melt, e.g., thin layers or droplets of melt material, having relatively small cross-sectional dimensions.
    Type: Grant
    Filed: September 30, 1987
    Date of Patent: January 23, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Jerry R. Bautista, Matthijs M. Broer, Allan J. Bruce, James W. Fleming, Kenneth L. Walker
  • Patent number: 4896319
    Abstract: A high capacity metropolitan area network (MAN) is described. Data traffic from users is connected to data concentrators at the edge of the network, and is transmitted over fiber optic data links to a hub where the data is switched. The hub includes a plurality of data switching modules, each having a control means, and each connected to a distributed control space division switch. Advantageously, the data switching modules, whose inputs are connected to the concentrators, perform all checking and routing functions, while the 1024.times.1024 maximum size space division switch, whose outputs are connected to the concentrators, provides a large fan-out distribution network for reaching many concentrators from each data switching module.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: January 23, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: William P. Lidinsky, Gary A. Roediger, Scott B. Steele, Ronald C. Weddige, Bruce R. Zelle
  • Patent number: 4895437
    Abstract: Homogeneous illumination of a strip of area (12) on a surface (13) of a substrate (10) is achieved by directing light at a plurality of first light-reflective members (22) arranged above the substrate in spaced relationship parallel to the longitudinal axis (17) of the strip. Each ligh-reflective member (22), which takes the form of a three-sided prism reflector, splits the light incident thereon into two beams (40) which are each reflected by the reflector in an opposite direction downwardly at the strip so as to strike it at a grazing angle. Light is also directed at a second light-reflective body (30) which takes the form of a metal bar spaced above the substrate parallel to the longitudinal axis (17). The bar has a light-reflective surface (32) which serves to reflect the light directed thereat towards the strip (12) at an inclined angle in a direction generally perpendicular to the beams (40) reflected by the first light-reflective members (22).
    Type: Grant
    Filed: February 27, 1989
    Date of Patent: January 23, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventor: Israel Amir
  • Patent number: 4894773
    Abstract: Method and apparatus for optimizing the operational state of a system employing iterative steps that approximately follow a projective scaling trajectory or an affine scaling trajectory, or curve, in computing from its present state, x.sub.0 to a next state x.sub.1 toward the optimum state. The movement is made in a transformed space where the present (transformed) state of the system is at the center of the space, and the curve approximation is in the form of a power series in the step size. The process thus develops a sequence of tentative states x.sub.1, x.sub.2, x.sub.n . . . . It halts when a selected suitable stopping criterion is satisfied, and assigns the most recent tentative state as the optimized operating state of the system.
    Type: Grant
    Filed: August 22, 1986
    Date of Patent: January 16, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventor: Jeffrey C. Lagarias
  • Patent number: 4894703
    Abstract: A back-illuminated InGaAs photodiode is described in which a double layer of silicon nitride on the front surface serves several functions; both layers passivate the surface; an opening in the lower layer provides a diffusion mask for forming the p-n junction; and a narrower opening in the upper silicon nitride layer provides a deposition mask for forming a restricted area contact. In order to reduce strain near the junction, and hence reduce leakage currents and enhance reliability, the contact geometry has a narrow pedestal portion which contacts the surface in a zone remote from the junction edges and has a wider cap portion which is formed on the pedestal portion to seal the surface from the introduction of contaminants.
    Type: Grant
    Filed: August 20, 1985
    Date of Patent: January 16, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Mahmoud A. E. Hamamsy, Stephen R. Forrest, John R. Zuber
  • Patent number: 4894526
    Abstract: A narrow-bandwidth, high-speed infrared radiation detector is based on tunneling of photo-excited electrons out of quantum wells. Infrared radiation incident on a superlattice of doped quantum wells gives rise to intersubband resonance radiation which excites electrons from the ground state into an excited state. A photocurrent results from excited electrons tunneling out of quantum wells. Conveniently, Group III-V materials can be used in device manufacture. Preferably, quantum well potential barriers are shaped so as to facilitate resonant tunneling of photocurrents as compared with dark current. Preferred device operation is at elevated bias voltage, giving rise to enhancement of photocurrent by a quantum-well-avalanche effect.
    Type: Grant
    Filed: September 15, 1987
    Date of Patent: January 16, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Clyde G. Bethea, Kwong-Kit Choi, Barry F. Levine, Roger J. Malik, John F. Walker