Patents Assigned to The Charles Stark Draper Lab., Inc.
  • Patent number: 5151877
    Abstract: A ferroelectric space charge capacitor memory system includes a ferroelectric space charge capacitor memory cell having two ferroelectric space charge capacitor memory devices; means for applying coercive write voltage to each of the memory devices to establish internal polarization fields and space charge regions of opposite polarity in each device, respectively; means for applying to each of the devices a bias voltage less than the coercive voltage at a rate slower than the rate of space charge formation to define a capacitive level representative of one of the polarization states; means for introducing to each of the devices a read signal at a rate faster than the rate of space charge formation, which together with the bias voltage is less than the coercive voltage; and means responsive to the read signal for indicating the difference in charge transferred by each memory device representing the logical state of the memory cell.
    Type: Grant
    Filed: December 19, 1990
    Date of Patent: September 29, 1992
    Assignee: The Charles Stark Draper Lab., Inc.
    Inventor: Ciaran J. Brennan
  • Patent number: 5151277
    Abstract: A reconfigurable fiber-forming resin transfer molding system including a sealed chamber with first and second spaced flexible diaphragms for holding a fiber workpiece and press and die mold surfaces for forming the fiber workpiece.
    Type: Grant
    Filed: March 27, 1991
    Date of Patent: September 29, 1992
    Assignee: The Charles Stark Draper Lab., Inc.
    Inventors: Edward Bernardon, Michael F. Foley
  • Patent number: 5131745
    Abstract: A positioning technique for grinding a conical tip on a fiber optic element includes rotatably mounting an end of the fiber optic element to be conically ground; detecting orbital motion of the optical axis of the fiber optic element about the mechanical axis of rotation; and adjusting the optical axis relative to the axis of rotation to minimize the orbital motion of the optical axis.
    Type: Grant
    Filed: November 2, 1990
    Date of Patent: July 21, 1992
    Assignee: The Charles Stark Draper Lab., Inc.
    Inventors: Daniel E. Whitney, Richard W. Metzinger, J. Kevin Champagne
  • Patent number: 5121460
    Abstract: An optical fiber includes a multimode primary core having an index or refraction N.sub.1 and doped with a material providing optical gain; the cladding surrounding the core having an index of refraction N.sub.2 ; and a secondary core doped with an absorbent material for providing optical loss in unwanted modes.
    Type: Grant
    Filed: January 31, 1991
    Date of Patent: June 9, 1992
    Assignee: The Charles Stark Draper Lab., Inc.
    Inventors: Richard P. Tumminelli, Farhad Hakimi
  • Patent number: 5077637
    Abstract: A solid state, directional, thermal cable including a bundle of elongated, flexible, carbon fibers having a high thermal conductivity in at least the longitudinal direction. Couplings at each end of the cable, bind together the fiber bundle and thermally engage the cable with objects having different temperatures, for transferring heat between the objects. The thermal cable may be used with a frame which supports a device to or from which heat is to be transferred. The thermal cable engages with the frame at a first region proximate the device, and with a second region remote from the device for transferring heat between the first and second regions. The heat transfer frame may include a composite material whose constituents have at least two different coefficients of thermal expansion, for establishing the overall coefficient of thermal expansion of the composite material. One of the constituents may have a negative coefficient of thermal expansion, and may be a carbon based material.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: December 31, 1991
    Assignee: The Charles Stark Draper Lab., Inc.
    Inventors: Richard T. Martorana, Thomas D. Heimann, John Bimshas