Patents by Inventor Andrew H. Bobeck

Andrew H. Bobeck 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: 4870649
    Abstract: A reflection filter is disposed on a solid state laser so as to preferentially reflect TE or TM modes and to suppress oscillation within the resonator of the non-reflected modes. In one embodiment, the filter includes a layer having a plurality of grooves which may be straight and parallel or curved to approximate the mode shape. In another embodiment, the filter includes a polarization sensitive film, without grooves, which either absorbs or transmits the undesired mode. Specifically described is a buried heterostructure semiconductor DFB laser with such a reflection filter formed on at least one facet thereof.
    Type: Grant
    Filed: December 28, 1988
    Date of Patent: September 26, 1989
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Andrew H. Bobeck, Lloyd R. Harriott, Robert L. Hartman, Daniel R. Kaplan, George J. Przybylek, William J. Tabor
  • Patent number: 4460976
    Abstract: A field-access magnetic bubble memory includes an improved expander-detector arrangement. An optimized element shape provides for a constant magnetic field strength at critical points in the drive field cycle. Improved high bias operation results.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: July 17, 1984
    Assignee: AT&T Bell Laboratories
    Inventor: Andrew H. Bobeck
  • Patent number: 4360893
    Abstract: Magnetic devices exemplified by bubble devices depend upon functional magnetic layers initially produced by epitaxy and reduced to effectively thinned surface layers by ion implantation. Implantation is at well-defined energy spectral levels which minimize effect on surface layers and which predominantly affect a "buried layer". As a result, such affected layer acts as a boundary layer of a functional layer which is spaced away from an interface between a substrate and a deposited layer.Commercial significance is primarily concerned with high bit density devices in which effectively thinned regions are less than 3 micrometers in thickness.
    Type: Grant
    Filed: June 26, 1980
    Date of Patent: November 23, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Andrew H. Bobeck, James C. North
  • Patent number: 4355373
    Abstract: A new geometry for the propagation elements of a field-access magnetic bubble memory is disclosed which is tolerant of relatively wide gaps between elements and lower drive fields. The elements have shapes which define bubble "traps" operative to hold bubbles for relatively high efficiency transfers between elements. In alternate embodiments, the elements have an L-shape or a "pickaxe" shape.
    Type: Grant
    Filed: November 24, 1980
    Date of Patent: October 19, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Andrew H. Bobeck
  • Patent number: 4345317
    Abstract: A Hall detector for magnetic bubbles is characterized by an apertured detection area designed to detect only the return field of the bubble. A series arrangement of the detectors is designed to mate with a bubble expander for detecting a strip domain for detecting the return field associated with a strip domain.
    Type: Grant
    Filed: July 25, 1980
    Date of Patent: August 17, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Andrew H. Bobeck
  • Patent number: 4314358
    Abstract: A conductor-access, magnetic bubble memory organized in the major-minor mode has minor loops separated into minor loop segments. The segments can be powered for moving bubbles selectively only within the corresponding segments of the minor loops. A transfer operation moves bubbles between minor loop segments permitting bubble movement to the major loop. The ability to move bubbles only in a selected set of corresponding segments of the loops at a time permits operation with highly attractive power requirements.
    Type: Grant
    Filed: December 20, 1979
    Date of Patent: February 2, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Andrew H. Bobeck
  • Patent number: 4228523
    Abstract: Continuous film type, current-access bubble memories are designed for low power operation by including, along the current paths, areas of reduced width. The areas of reduced widths are characterized by relatively high current densities, which are preferred, for example, for expansion detected or operation, without an increase in power consumption.
    Type: Grant
    Filed: March 8, 1979
    Date of Patent: October 14, 1980
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Andrew H. Bobeck
  • Patent number: 4187555
    Abstract: A conductor access, magnetic bubble memory is organized in a major-minor mode by including transfer locations in the conducting layers which define the normal bubble propagation implementation. An attractive partitioning of each of the two conducting layers permits the minor loops and the major loop to be operated synchronously or independently resulting in short duty cycles which permit low power operation to be achieved.
    Type: Grant
    Filed: February 23, 1979
    Date of Patent: February 5, 1980
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Andrew H. Bobeck
  • Patent number: 4181979
    Abstract: Magnetic bubble functional elements are implemented by aperture patterns in a single layer of electrically-conducting material. The operations of the elements are compatible with single-level conductor driven bubble memories described in A. H. Bobeck patent applications, Ser. Nos. 857,921 now U.S. Pat. No. 4,143,419 issued Mar. 6, 1979 and 856,925, filed Dec. 6, 1977, and in A. H. Bobeck-F. J. Ciak patent application, Ser. No. 899,578, filed Apr. 24, 1978 now abandoned.
    Type: Grant
    Filed: June 12, 1978
    Date of Patent: January 1, 1980
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Andrew H. Bobeck
  • Patent number: 4181978
    Abstract: An expander-detector arrangement for a conductor-access, magnetic bubble memory is realized by the inclusion in an electrically-conducting layer in which bubble propagation currents are impressed sets of apertures operative to enlarge a bubble laterally. For this purpose increasingly greater numbers of apertures are arranged laterally with respect to the axis of bubble movement through successive stages of the expander-detector arrangement. The actual detector is formed at the stage including the maximum number of apertures.
    Type: Grant
    Filed: April 24, 1978
    Date of Patent: January 1, 1980
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Andrew H. Bobeck
  • Patent number: 4162537
    Abstract: A high speed magnetic bubble memory is realized with two like-apertured metallic layers each adapted for substantially uniform overall current flow. The apertures locally modify the current flow to provide localized field gradients for moving bubbles in an adjacent bubble layer. The patterns of apertures in the two layers are offset with respect to one another and the layers are pulsed in sequence in a manner to move bubbles along propagation paths defined by the patterns of apertures.
    Type: Grant
    Filed: June 12, 1978
    Date of Patent: July 24, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Andrew H. Bobeck
  • Patent number: 4143419
    Abstract: A conductor-access magnetic bubble memory is realized with a single electrically-conductive film for the propagation of bubbles. The film is characterized by sequences of apertures in the film. The sequences define paths for bubble movement in response to controlled current pulses. Ion-implanted regions offset with respect to the aperture edges ensure unidirectional bubble movement along the paths.
    Type: Grant
    Filed: December 6, 1977
    Date of Patent: March 6, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Andrew H. Bobeck
  • Patent number: 4143420
    Abstract: A conductor-access, magnetic bubble memory is realized with a single metallization level for propagation. The familiar undulating or serpentine conductor pattern used for moving bubbles is modified to allow a simple and easily realizable, low power drive arrangement where currents flow parallel to the bubble paths.
    Type: Grant
    Filed: December 6, 1977
    Date of Patent: March 6, 1979
    Assignee: Bell Telephone Laboratories Incorporated
    Inventor: Andrew H. Bobeck
  • Patent number: 4142247
    Abstract: A magnetic bubble memory with a single electrically-conducting layer for defining a bubble propagate arrangement is adapted to provide a compatible bubble expander detector by a sequence of increasingly larger apertures in the conducting layer.
    Type: Grant
    Filed: December 6, 1977
    Date of Patent: February 27, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Andrew H. Bobeck
  • Patent number: 4142249
    Abstract: A low power, conductor-access, bubble memory is realized with a single level of metallization for providing the requisite propagation fields. Sets of apertures in the conducting layer define bubble paths, and permalloy elements aligned with the apertures overlie the conducting layer at end portions and contact the exposed bubble layer at midportions. Current flow is established transverse to the bubble paths.
    Type: Grant
    Filed: December 6, 1977
    Date of Patent: February 27, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Andrew H. Bobeck