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  • Shaping optical pulses by amplitude and phase masking
    Patent number: 4655547
    Abstract: Embodiments of the present invention control, manipulate and tailor the shape of input optical pulses to produce substantially transform-limited output pulses which can be shorter than the input pulses.In embodiments of a first aspect of the present invention an input optical pulse is chirped, the chirped pulse is then passed through an optical component that spatially disperses the frequency components of the chirped pulse and partially compensates the chirp, the spatially dispersed frequency components are then passed through spatial amplitude and/or phase masks that control and/or adjust the amplitude and/or phase of the frequency components, and, finally, the masked components are passed through the first or a second optical component that returns the masked, spatially dispersed frequency components substantially to the spatial distribution of the input pulse while substantially completing the compensation of the chirp to form an output pulse.
    Type: Grant
    Filed: April 9, 1985
    Date of Patent: April 7, 1987
    Assignee: Bell Communications Research, Inc.
    Inventors: Jonathan P. Heritage, Andrew M. Weiner
  • Cutter housing for power-driven lawn mower
    Patent number: 4711077
    Abstract: A cutter housing for use in a power-driven lawn mower has a substantially cylindrical skirt wall and a top wall covering the upper end of the skirt wall. The top wall has a substantially central recess for accomodating the engine of the lawn mower and includes a pair of half members positioned one on each side of the recess and lying substantially flush with each other in symmetrical and contiguous relation. The cutter housing also has a rear housing portion extending rearwardly in contiguous relation to the skirt wall and the top wall, and a partition disposed in the rear housing portion and dividing the rear housing portion into two spaces. The skirt wall, the top wall, the rear housing portion, and the partition are integrally molded of synthetic resin.
    Type: Grant
    Filed: December 2, 1985
    Date of Patent: December 8, 1987
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Mitsuhiro Kutsukake, Takahiko Murata, Gunji Saito, Takeshi Komatsuzaki, Kuniaki Uehara, Toshinobu Kato, Takeo Hattori, Morimasa Hayashida
  • Simulated racing board game and methods of utilizing same
    Patent number: 5048841
    Abstract: A racing board game apparatus for use by a plurality of players which comprises a game board having a simulated race course of depicted thereon, including a plurality of racing lanes, a plurality of playing pieces each representing a player for movement along the simulated race course, a random number generator for determining a sequential playing order to be followed by the players in turn, and cards for determining a plurality of potential movements of each playing piece at a given turn. Each of the racing lanes is divided into a plurality of discreet, sequential playing spaces and each racing lane is designated as one of the four suits in a standard deck of playing cards. The determining cards include at least one deck of standard playing cards to be distributed to and strategically discarded by the players throughout the course of a game for determining movements of the playing pieces along the simulated race course.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: September 17, 1991
    Assignee: Bar M. Company
    Inventors: Rodney A. Manney, Milton V. Manney, Bruce I. Manney
  • Battery cell design for a bipolar rechargeable battery
    Patent number: 5882817
    Abstract: Plastic hydrophobic material is bonded to a metallic sheet member such that the resulting sandwich structure is impervious to electrochemical delamination. First and second films of the plastic hydrophobic material are applied to opposed surfaces of the metallic sheet member and extend beyond a peripheral edge of the metallic sheet member to form contiguous border portions. A plurality of perforations are formed through the metallic sheet member at locations spaced from its peripheral edge. A resulting sandwich structure of the metallic sheet member and the first and second films are compressed and simultaneously the temperature is raised to the sintering temperature of the hydrophobic film material. The first and second films are caused to melt sufficiently at their interfaces to cause an intermixing of the juxtaposed material thereof throughout the region of the border portions and throughout the regions of the perforations.
    Type: Grant
    Filed: March 3, 1997
    Date of Patent: March 16, 1999
    Assignee: Space Systems/Loral, Inc.
    Inventors: John C. Hall, Bruce Inenaga
  • Crystallization and doping of amorphous silicon on low temperature plastic
    Patent number: 5346850
    Abstract: A method or process of crystallizing and doping amorphous silicon (a-Si) on a low-temperature plastic substrate using a short pulsed high energy source in a selected environment, without heat propagation and build-up in the substrate. The pulsed energy processing of the a-Si in a selected environment, such as BF3 and PF5, will form a doped micro-crystalline or poly-crystalline silicon (pc-Si) region or junction point with improved mobilities, lifetimes and drift and diffusion lengths and with reduced resistivity. The advantage of this method or process is that it provides for high energy materials processing on low cost, low temperature, transparent plastic substrates. Using pulsed laser processing a high (>900.degree. C.), localized processing temperature can be achieved in thin films, with little accompanying temperature rise in the substrate, since substrate temperatures do not exceed 180.degree. C. for more than a few microseconds.
    Type: Grant
    Filed: October 29, 1992
    Date of Patent: September 13, 1994
    Assignee: Regents of the University of California
    Inventors: James L. Kaschmitter, Joel B. Truher, Kurt H. Weiner, Thomas W. Sigmon
  • Laser-assisted fabrication of bipolar transistors in silicon-on-sapphire (SOS)
    Patent number: H1637
    Abstract: The fabrication of bipolar junction transistors in silicon-on-sapphire (SOS) relies upon the laser-assisted dopant activation in SOS. A patterned 100% aluminum mask whose function is to reflect laser light from regions where melting of the silicon is undesirable is provided on an SOS wafer to be processed. The wafer is placed within a wafer carrier that is evacuated and backfilled with an inert atmosphere and that is provided with a window transparent to the wavelength of the laser beam to allow illumination of the masked wafer when the carrier is inserted into a laser processing system. A pulsed laser (typically an excimer laser) beam is appropriately shaped and homogenized and one or more pulses are directed onto the wafer. The laser beam pulse energy and pulse duration are set to obtain the optimal fluence impinging on the wafer in order to achieve the desired melt duration and corresponding junction depth.
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: March 4, 1997
    Inventors: Bruce W. Offord, Stephen D. Russell, Kurt H. Weiner
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