Patents Represented by Attorney Laurence S. Rogers
  • Patent number: 5365118
    Abstract: A driver circuit for driving top and bottom power transistors stacked between two supply terminals is provided. The driver circuit includes shoot-through reduction means for monitoring the gate-to-source voltages of the two power transistors so as to inhibit the turning-ON of each power transistor until the gate-to-source voltage of the other power transistor has fallen to a voltage level indicative of the other transistor being OFF. Additionally, the driver circuit which can utilize a bootstrap capacitor for providing enhanced voltages to drive the top power transistor, also includes a bootstrap capacitor recharge means to monitor the output voltage of the circuit so as to inhibit the turning-ON of the top power transistor until the bootstrap capacitor has had sufficient time to recharge.
    Type: Grant
    Filed: June 4, 1992
    Date of Patent: November 15, 1994
    Assignee: Linear Technology Corp.
    Inventor: Milton E. Wilcox
  • Patent number: 5334928
    Abstract: A three terminal control circuit for a low dropout voltage regulator having a PNP pass transistor is provided. The control circuit is capable of pulling the base drive point down to a voltage of 3.0 volts or less to permit a current limiting resistor to be inserted between the base drive point and the base of the PNP pass transistor. The control circuit includes a pair of small-valued capacitors for providing stable operation with different output capacitors. The control circuit can also be used with p-channel FET pass transistors.
    Type: Grant
    Filed: July 27, 1993
    Date of Patent: August 2, 1994
    Assignee: Linear Technology Corporation
    Inventors: Robert C. Dobkin, Carl T. Nelson, Dennis P. O'Neill
  • Patent number: 5329310
    Abstract: A method and apparatus for displaying an image that is subject to multiple distortions substantially without distortion is provided. The image is recorded from a first viewpoint and subject to a first distortion and played back from a second viewpoint and subject to a second distortion. The display surface may also be distorted (e.g., curved). By mapping back through the projector to the screen and through the camera (at the viewpoint), the image is transformed so that it can be viewed from the viewpoint with little or no distortion.
    Type: Grant
    Filed: June 30, 1992
    Date of Patent: July 12, 1994
    Assignee: The Walt Disney Company
    Inventors: Gordon E. Liljegren, William G. Redmann, Scott F. Watson
  • Patent number: 5327095
    Abstract: A method and circuit for increasing the output impedance of an inactive amplifier is provided. The method and circuit allows an increased number of amplifiers to be coupled in parallel to a single transmission line for distributing a plurality of video or other electrical signals to a remote location. The method and circuit increasing the impedance of an amplifier feedback network during inactive operation using a bootstrapping technique (i.e., by driving the feedback network) so as to increase the overall impedance of the amplifier during such operation.
    Type: Grant
    Filed: February 19, 1993
    Date of Patent: July 5, 1994
    Assignee: Linear Technology Corporation
    Inventors: William H. Gross, John W. Wright
  • Patent number: 5316341
    Abstract: A blank book attachment having a mark and sweep leaf with a fold out feature is provided. The leaf is pivotally retained along one edge on a frame, and the frame is pivotally retained at the binding spine of the host blank book. Pulling outward on the leaf causes the leaf to extend out and beyond the pages of the book allowing the pages to turn freely. When the leaf is placed within the host book, with the book open or closed, the leaf can be turned as a page, in which case it also acts as a mark to identify a specific position in the host book. Alternatively, the leaf may be pivoted on the frame to allow the host book pages to be turned past it in either direction.
    Type: Grant
    Filed: March 8, 1990
    Date of Patent: May 31, 1994
    Assignee: Productive Environments, Inc.
    Inventor: David C. Schwartz
  • Patent number: 5258662
    Abstract: A power efficient circuit for charging the gate of a transistor switch to a charge-pumped voltage level in excess of a supply rail voltage is provided. The circuit includes a current-controlled oscillator which generates an oscillating waveform that drives a capacitive charge-pump circuit. The circuit monitors the gate voltage of the transistor switch and reduces the frequency of the oscillating waveform, thereby reducing power consumption, when the gate voltage exceeds a frequency switching value indicating that the transistor switch has been sufficiently turned so as to allow the circuit to enter a micropower mode.
    Type: Grant
    Filed: April 6, 1992
    Date of Patent: November 2, 1993
    Assignee: Linear Technology Corp.
    Inventor: Timothy J. Skovmand
  • Patent number: 5182526
    Abstract: A differential input amplifier stage having improved frequency compensation. Frequency compensation is achieved by cancelling one-half of the signal output of a differential error amplifier in the input stage, such that all error signals must pass through a "current-mirror" type load circuit in which a resistor-capacitor network is provided to roll off gain of the input stage.
    Type: Grant
    Filed: July 18, 1991
    Date of Patent: January 26, 1993
    Assignee: Linear Technology Corporation
    Inventor: Carl T. Nelson
  • Patent number: 5163130
    Abstract: A graphic interface configuration system is allows a user to create a graphic interface for a computer program in which graphic elements in the interface are linked to variables or functions in any one of a number of programming elements.
    Type: Grant
    Filed: May 5, 1992
    Date of Patent: November 10, 1992
    Assignee: NeXT Computer, Inc.
    Inventor: Jean-Marie Hullot
  • Patent number: 5146556
    Abstract: A graphic user interface for a computer is provided in which representations of application programs can be placed on the display in a specified area reserved for such a purpose in which area they could not be so readily obscured and forgotten, and which includes a facility for controlling the placement of such representations within the reserved area. The graphic images are guided into specific locations, or "docks" in the reserved area, and their removal from the docks is restricted to prevent accidental withdrawal.
    Type: Grant
    Filed: February 27, 1991
    Date of Patent: September 8, 1992
    Assignee: NeXT Computer, Inc.
    Inventors: Jean-Marie Hullot, Steven P. Jobs, Christopher M. Franklin
  • Patent number: 5144576
    Abstract: A rectangular array signed digit multiplier circuit (10) is disclosed which comprises a multiplier core (28). The circuit (10) comprises a C-latch (14), a D-latch (18), an A-latch (26), and a feedback latch (52) operable to store operands to be input into the multiplier core (28) through a MULTIPLIER INPUT, a multiplicand INPUT, and ADDER INPUT and a FEEDBACK INPUT, respectively, The product output by the multiplier core (28) may comprise the sum of the product of the values input through the MULTIPLIER INPUT and MULTIPLICAND INPUT and the ADDER and FEEDBACK INPUTS. The product is stored in a result latch (40) and may be used in subsequent passes through multiplier core (28) through the use of a data path coupling result latch (40) with feedback latch (52). Multiplier core (28) comprises a series connection of a times three adder level (56), a Booth recoder level (58), a partial product generator level (60), a level one adder level (62), a level two adder level (64) and a level three adder level (66).
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: September 1, 1992
    Assignee: Cyrix Corporation
    Inventors: Willard S. Briggs, David W. Matula
  • Patent number: 5048869
    Abstract: A blank book attachment having a mark and sweep leaf with a fold out feature is provided. The leaf is pivotably retained along one edge on a frame, and the frame is pivotably retained at the binding spine of the host blank book. Pulling outward on the leaf causes the leaf to extend out and beyond the pages of the book allowing the pages to turn freely. When the leaf is placed within the host book, with the book open or closed, the leaf can be turned as a page, in which case it also acts as a mark to identify a specific position in the host book. Alternatively, the leaf may be pivoted on the frame to allow the host book pages to be turned past it in either direction.
    Type: Grant
    Filed: January 8, 1990
    Date of Patent: September 17, 1991
    Assignee: Productive Environments, Inc.
    Inventor: David C. Schwartz
  • Patent number: 4982343
    Abstract: A method and apparatus for performing graphic compositing operations in a computer system, with improved system performance, is provided. The apparatus and method performs the plurality of compositing operations by implementing a series of write functions, selected from a group of write functions, in a predetermined combination or order.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: January 1, 1991
    Assignee: NeXT, Inc.
    Inventors: Leonard J. Hourvitz, John K. Newlin, Richard A. Page
  • Patent number: D312447
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: November 27, 1990
    Assignee: NeXT, Inc.
    Inventor: Hartmut Esslinger
  • Patent number: D312629
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: December 4, 1990
    Assignee: NeXT, Inc.
    Inventor: Hartmut Esslinger
  • Patent number: D312630
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: December 4, 1990
    Assignee: NeXT, Inc.
    Inventor: Hartmut Esslinger
  • Patent number: D313402
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: January 1, 1991
    Assignee: NeXT, Inc.
    Inventor: Hartmut Esslinger
  • Patent number: D317291
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: June 4, 1991
    Assignee: NeXT Computer, Inc.
    Inventor: Hartmut Esslinger
  • Patent number: D317760
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: June 25, 1991
    Assignee: NeXT Computer, Inc.
    Inventor: Hartmut Esslinger
  • Patent number: D318265
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: July 16, 1991
    Assignee: NeXT Computer, Inc.
    Inventor: Hartmut Esslinger
  • Patent number: D319461
    Type: Grant
    Filed: August 24, 1988
    Date of Patent: August 27, 1991
    Assignee: NeXT Computer, Inc.
    Inventor: Hartmut Esslinger