Patents by Inventor Ralph Johnson

Ralph Johnson 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).

  • Publication number: 20050129078
    Abstract: Multi-component barrier layers include formation of a GaAs layer and at least one adjacent GaAsN layer. The resulting multi-component barrier layer shape can provide enhanced (extended) offset for capture of holes and enhanced electrons. Other benefits include: a small amount of strain compensation; poorer spatial overlap of higher confined states reducing parasitics at high bias, with some small effect on the lowest confined states. Quantum wells and associated barriers layers can be grown with combinations of gallium, (Ga), arsenic, (As), nitrogen (N), aluminum (Al), antimony (Sb), phosphorous (P) and/or indium (In) placed within or about a typical GaAs substrate to achieve long wavelength VCSEL performance, e.g., with wavelengths over 1200 nm. Layers of strained quantum well material can also be supported by mechanical stabilizers.
    Type: Application
    Filed: October 1, 2004
    Publication date: June 16, 2005
    Inventor: Ralph Johnson
  • Publication number: 20050123015
    Abstract: Incorporation of a GaAs “Extended lower barrier” in between quantum wells using nitrogen and confining layers using aluminum. Not to be confused with barrier layers used in quantum wells, the extended lower barrier is formed between the active region and the outer/confining layers where N and Al are respectively used. N and Al can be separated in the case where, for example, AlGaAs is being used in the confining layers and any nitrogen containing material is being used in the active region. Aluminum and Nitrogen when allowed to combine can cause deep traps and resultant non-radiative recombination, therefore N and Al pairing should be prevented. The GaAs extended barrier layer can provide a protective measure against such combination.
    Type: Application
    Filed: October 1, 2004
    Publication date: June 9, 2005
    Inventor: Ralph Johnson
  • Publication number: 20050092710
    Abstract: A process for making a laser structure. The process is for the fabrication of a laser device such a vertical cavity surface emitting laser (VCSEL). The structures made involve dielectric and spin-on material planarization over wide and narrow trenches, coplanar contacts, non-coplanar contacts, thick and thin pad dielectric, air bridges and wafer thinning.
    Type: Application
    Filed: October 29, 2003
    Publication date: May 5, 2005
    Inventors: James Biard, Klein Johnson, Ralph Johnson, Gyoungwon Park, Tzu-Yu Wang
  • Publication number: 20050067931
    Abstract: An LED light source (10) has a housing (12) with a base (14) and a hollow core (16) projecting from the base (14), the core (16) being substantially conical. A first printed circuit board (18) is fitted to the base (14). A second printed circuit board (20) is fitted to the narrow end (22) of the core (16), the second printed circuit board (20) having at least one LED (24) operatively fixed thereto. A plurality of electrical conductors 26 is provided having proximal ends (28) attached to and extending from the second printed circuit board (20) and distal ends (30) attached to and projecting through the first printed circuit board (18). A cap (32) is fitted over the second printed circuit board (20) and a heat sink (34) is attached to the base (14) and in contact with the distal ends (30) of the electrical conductors (26). The housing (12) is provided with flanges for engaging a suitable opening in the rear of a reflector.
    Type: Application
    Filed: May 5, 2004
    Publication date: March 31, 2005
    Inventors: Charles Coushaine, Ralph Johnson, Russell Holden, John Sanroma
  • Publication number: 20050047474
    Abstract: The invention is generally concerned with vertical cavity surface emitting lasers. In one example, the vertical cavity surface emitting laser includes, among other things, an upper mirror structure having a metal contact, a top mirror above the metal contact, and a semiconductive top DBR having an insulation region, wherein the top DBR is no more than 3.5 microns thick and is disposed below the metal contact. Thus, the top DBR is sufficiently thick as to enable adequate current spreading, but thin enough to enable fabrication of an isolation region using relatively low energy ion implantation or relatively shallow etching.
    Type: Application
    Filed: September 3, 2004
    Publication date: March 3, 2005
    Inventors: Ralph Johnson, Tzu-Yu Wang
  • Publication number: 20050034661
    Abstract: Systems produce flattening layers associated with nitrogen-containing quantum wells and prevent 3-D growth of nitrogen containing layers using high As fluxes. MEE (Migration Enhanced Epitaxy) is used to flatten layers and enhance smoothness of quantum well interfaces and to achieve narrowing of the spectrum of light emitted from nitrogen containing quantum wells. MEE is performed by alternately depositing single atomic layers of group III and V before, and/or after, and/or in-between quantum wells. Where GaAs is used, the process can be accomplished by alternately opening and closing Ga and As shutters in an MBE system, while preventing both from being open at the same time. Where nitrogen is used, the system incorporates a mechanical means of preventing nitrogen from entering the MBE processing chamber, such as a gate valve. The gate valve allows the nitrogen source to be completely cut-off from the chamber during non-nitrogen processing steps.
    Type: Application
    Filed: August 31, 2004
    Publication date: February 17, 2005
    Inventors: Ralph Johnson, Virgil Blasingame
  • Publication number: 20050031011
    Abstract: A VCSEL having an N-type Bragg mirror with alternating layers of high bandgap (low index) and low bandgap (high index) layers of AlGaAs. The layers may be separated by a step change of Al composition followed by a graded region, and vice versa for the next layer, in the N-type mirror to result in a lower and more linear series resistance. Also, an N-type spacer layer may be adjacent to an active region of quantum wells. There may be a similar step in a change of Al composition from the nearest layer of the N-type mirror to the N-type spacer formed from a lower bandgap direct AlGaAs layer to provide lower free carrier absorption. With electron affinity engineering, a minority carrier hole barrier may be inserted adjacent to the quantum wells to improve hole confinement at high current density and high temperature.
    Type: Application
    Filed: January 29, 2004
    Publication date: February 10, 2005
    Inventors: James Biard, Ralph Johnson, Klein Johnson
  • Patent number: 6775051
    Abstract: Systems and methods for scanning a beam of light over a specimen are provided. A system may include a pre-scan acousto-optical deflector (AOD) configured to deflect a beam of light, a second AOD configured as a traveling lens to focus the scanning beam, a relay lens, and an objective lens. The relay lens may be centered on the scan line produced by the second AOD, while the objective lens may be substantially de-centered with respect to the relay lens to produce a telecentric scanning spot with no field tilt. The system may modulate the amplitude of the sound wave in the first AOD to compensate for attenuation in the second AOD. The system may pre-fill one chirp packet in the second AOD while another chirp packet is scanning to substantially reduce a delay between consecutive scans.
    Type: Grant
    Filed: May 3, 2002
    Date of Patent: August 10, 2004
    Assignee: KLA-Tencor Technologies
    Inventors: Jamie Sullivan, Ralph Johnson, John Gibson, Mingguang Li, Eric Vella
  • Publication number: 20020181119
    Abstract: Systems and methods for scanning a beam of light over a specimen are provided. A system may include a pre-scan acousto-optical deflector (AOD) configured to deflect a beam of light, a second AOD configured as a traveling lens to focus the scanning beam, a relay lens, and an objective lens. The relay lens may be centered on the scan line produced by the second AOD, while the objective lens may be substantially de-centered with respect to the relay lens to produce a telecentric scanning spot with no field tilt. The system may modulate the amplitude of the sound wave in the first AOD to compensate for attenuation in the second AOD. The system may pre-fill one chirp packet in the second AOD while another chirp packet is scanning to substantially reduce a delay between consecutive scans.
    Type: Application
    Filed: May 3, 2002
    Publication date: December 5, 2002
    Inventors: Jamie Sullivan, Ralph Johnson, John Gibson, Mingguang Li, Eric Vella
  • Patent number: 6024127
    Abstract: A down spout clean out adapter (10) connectable to a bottom distal end of a leader (18). The down spout clean out adapter (10) having an adapter (12) which has an adapter upper front (12UF) having an adapter upper front opening (12UFA) and an adapter upper left (12UL) having an adapter left guide and an adapter upper right (12UR) having an adapter right guide and an adapter upper back (12UB). The down spout clean out adapter (10) further has a door (16) which has a door top (16T) and a door front (16F) and a door back (16B) and a door bottom (16A) and a door left (16L) and a door right (16R). The door (16) is removably positionable between the adapter left guide and the adapter right guide.
    Type: Grant
    Filed: August 20, 1998
    Date of Patent: February 15, 2000
    Assignee: Allied Irrigation, Inc.
    Inventor: Wm. Ralph Johnson
  • Patent number: 5836716
    Abstract: A subsurface drainage pipe includes a tubular main pipe body having inner and outer surfaces and a longitudinal central axis. Walls defining a plurality of slot-shaped apertures through the inner and outer surfaces along the length of the main pipe body are provided. The slot shaped apertures are angled with respect to the central axis.
    Type: Grant
    Filed: February 5, 1997
    Date of Patent: November 17, 1998
    Inventors: Wm. Ralph Johnson, Raymond Johnson, III
  • Patent number: 5604585
    Abstract: Light scattered from illuminated spot on a patterned wafer is first passed through a di-electric filter and then by an optical fiber bundle to a detector. The di-electric filter controls the aperture of the light that is passed to a desired azimuth angle and the optical fiber further limits the aperture.
    Type: Grant
    Filed: March 31, 1995
    Date of Patent: February 18, 1997
    Assignee: Tencor Instruments
    Inventors: Ralph Johnson, Keith Wells, Lee K. Galbraith
  • Patent number: 5502306
    Abstract: There is disclosed numerous embodiments of a method and apparatus for a particle scanning system and an automatic inspection system. In each of these a particle beam is directed at the surface of a substrate for scanning that substrate. Also included are a selection of detectors to detect at least one of the secondary particles, back-scattered particles and transmitted particles from the substrate. The substrate is mounted on an x-y stage to provide it with at least one degree of freedom while the substrate is being scanned by the/particle beam. The substrate is also subjected to an electric field on it's surface to accelerate the secondary particles. The system also has the capability to accurately measure the position of the substrate with respect to the charged particle beam. Additionally, there is an optical alignment means for initially aligning the substrate beneath the,particle beam means.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: March 26, 1996
    Assignee: KLA Instruments Corporation
    Inventors: Dan Meisburger, Alan D. Brodie, Curt Chadwick, Anil Desai, Hans Dohse, Dennis Emge, John Greene, Ralph Johnson, Ming-Yie Ling, John McMurtry, Barry Becker, Ray Paul, Mike Robinson, Richard Simmons, David E. A. Smith, John Taylor, Lee Veneklasen, Dean Walters, Paul Wieczorek, Sam Wong, April Dutta, Surendra Lele, Kirkwood Rough, Henry Pearce-Percy, Jack Y. Jau, Chun C. Lin, Hoi T. Nguyen, Yen-Jen Oyang, Timothy L. Hutcheson, David J. Clark, Chung-Shih Pan, Chetana Bhaskar, Chris Kirk, Eric Munro
  • Patent number: 5138226
    Abstract: A miniature incandescent lamp assembly has an elongated substantially cylindrical glass envelope having a first end and a second end. A substantially cylindrical first metal end member seals the first end of the glass envelope with a seal of substantially cylindrical configuration where the glass of the envelope is in glass-to-metal contact with the first metal end member. A substantially cylindrical second metal end member seals the second end of the glass envelope with another seal of substantially cylindrical configuration. In this seal also, the glass of the envelope is in glass-to-metal contact with the second metal end member. An incandescent filament is disposed between the first and second metal end members within the interior of the glass envelope in electrical contact with the first and second metal end members. Each of the first and second metal end members has a metal cap attached to the outside of the glass envelope, with the metal caps being larger in diameter than the glass envelope.
    Type: Grant
    Filed: February 13, 1991
    Date of Patent: August 11, 1992
    Assignee: Illumination Technology, Inc.
    Inventor: Ralph Johnson
  • Patent number: 4929224
    Abstract: A method and apparatus for the automatic manufacture of flat bottom bags from a substantially continuous supply of a sealable material whereby the material is formed as a bag having a reinforced sealed flat bottom formed by an interior bag forming assembly that is cooperable with a relatively movable folder assembly that folds the bottom of the bag and removes it from the bag former assembly after a length of the bag is severed from the remainder of the material.
    Type: Grant
    Filed: June 3, 1988
    Date of Patent: May 29, 1990
    Assignee: Violet Hanson
    Inventors: Violet Hanson, Ralph Johnson
  • Patent number: 4448362
    Abstract: A turntable is rotated to wind the tape of a taped program thereon in equal lengths per revolution thereof. Each equal winding forces the preceeding windings inwardly on the turntable to assume progressively curving paths as the respective windings recede from the periphery of the turntable. Pressure pads are equally spaced around the periphery of the turntable and rotate therewith. The pressure pads extend radially, and frictionally engage the top edges of the tape windings which follow increasingly curved paths therebetween as the equal windings are forced inwardly by succeeding equal windings. The ends of the tape are connected leaving a portion of the closed loop formed thereby for engagement by associated apparatus and rendition thereby of the taped program.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: May 15, 1984
    Inventor: J. Ralph Johnson
  • Patent number: 4066221
    Abstract: A turntable is rotated to wind the tape of a taped program thereon in equal lengths per revolution thereof. Each equal winding forces the preceeding windings inwardly on the turntable to assume progressively curving paths as the respective windings recede from the periphery of the turntable. Pressure pads are equally spaced around the periphery of the turntable and rotate therewith. The pressure pads extend radially, and frictionally engage the top edges of the tape windings which follow increasingly curved paths therebetween as the equal windings are forced inwardly by succeeding equal windings. The ends of the tape are connected leaving a portion of the closed loop formed thereby for engagement by associated apparatus and rendition thereby of the taped program.
    Type: Grant
    Filed: October 27, 1976
    Date of Patent: January 3, 1978
    Inventor: J. Ralph Johnson
  • Patent number: D439402
    Type: Grant
    Filed: February 22, 2000
    Date of Patent: March 27, 2001
    Inventor: John Clinton Ralph Johnson