Patents by Inventor Gregory Walter

Gregory Walter 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: 20020032432
    Abstract: An attachment tool to facilitate the attachment of a catheter or similar elongated instrument to a guide-wire or other elongated guide member, without requiring access to either end of said wire or member. Said tool providing repeatable and reliable alignment of components to be attached, while being operated with a single hand. The tool further facilitates the attachment of a plurality of catheters or instruments to a single wire or member.
    Type: Application
    Filed: May 21, 2001
    Publication date: March 14, 2002
    Inventors: John E. Nash, Gregory Walters, Douglas G. Evans, David Szabo, Michael Paris
  • Publication number: 20010048070
    Abstract: A photodetector device comprising a photosensitive detector (12; 96) and one or more interfaces (20′, 20″, 28, 98) between dissimilar media is configured so that a light beam (LB) for detection will pass through the interface(s) along a beam axis that is not normal to the interface(s). The deviation (&thgr;) from the normal will be such that polarization dependent transmission introduced at the interface(s) will compensate for inherent polarization dependency of the detector (12; 96). The deviation may be achieved by inclining the interface(s) relative to a predetermined direction along which the light beam will be incident. Where the photosensitive detector is in a housing (84) with a window (20) through which the light beam enters the housing, the housing can be tilted. In such as case, there are three interfaces, one (28; 98) at the surface of the detector (12; 96), and one at each surface (20′, 20″) of the window (20).
    Type: Application
    Filed: March 2, 2001
    Publication date: December 6, 2001
    Inventors: Gang He, Francois Babin, Martin Tremblay, Marc Breton, Steeve Potvin, Gregory Walter Schinn
  • Publication number: 20010030745
    Abstract: An optical spectrum analyzer comprises a diffraction grating (DG), a polarization decomposing unit (PDM) for decomposing the input light beam into first and second light beams having mutually-perpendicular linear states of polarization, and two output ports (FP2/1, FP2/2) each for receiving from the grating, substantially exclusively, a respective one of the polarized light beams (LT, LR) after diffraction by the diffraction grating (DG).
    Type: Application
    Filed: January 4, 2001
    Publication date: October 18, 2001
    Applicant: EXFO Electro-Optical Engineering Inc.
    Inventors: Gang He, Daniel Gariepy, Gregory Walter Schinn
  • Patent number: 6300025
    Abstract: A photoconductor having a charge generation layer of pigment and a binder resin of a thorough mixture of polyvinylbutyral, a polysiloxane, and, preferably, a phenolic resin. An optimum formulation was Type IV oxotitanium phthalocyanine in a binder of, by weight 50 parts polyvinylbutyral, 45 parts poly(methyl-phenyl)siloxane, and 5 parts polyhydroxystyrene. This photoconductor provides excellent electrical properties and consistent, economical coating results.
    Type: Grant
    Filed: June 1, 2000
    Date of Patent: October 9, 2001
    Assignee: Lexmark International, Inc.
    Inventors: Gregory Walter Haggquist, Scott Thomas Mosier, Kasturi Rangan Srinivasan
  • Patent number: 6214502
    Abstract: Charge generation layers comprise a charge generation compound and a binder which comprises polyvinylbutyral and phenolic resol. Dual layer photoconductors comprise the charge generation layer in combination with a substrate and a charge transport layer, in which the charge generation layer comprises a charge generation compound and a binder which comprises polyvinylbutyral and phenolic resol. Dual layer photoconductors comprise the charge generation layer in combination with a substrate and a charge transport layer, in which the charge generation layer comprises a charge generation compound and a binder which comprises polyvinylbutyral and a resin selected from the group consisting of phenol novolac and polyhydroxystyrene.
    Type: Grant
    Filed: March 28, 2000
    Date of Patent: April 10, 2001
    Assignee: Lexmark International, Inc.
    Inventors: Kasturei Rangan Srinivasan, Ronald Harold Levin, Garry D. Hinch, Gregory Walter Haggquist
  • Patent number: 6071660
    Abstract: A photoconductor for use in electrophotographic reproduction devices is disclosed. This photoconductor exhibits dramatically reduced end seal and paper area wear, as well as reduced positive electrical fatigue. The photoconductor of the present invention includes a low surface energy polyolefin wax, such as polyethylene or polypropylene, in relatively large particulate form having a mean particle diameter of from about 6 to about 12.mu., homogeneously dispersed in its charge transport layer.
    Type: Grant
    Filed: March 12, 1999
    Date of Patent: June 6, 2000
    Assignee: Lexmark International, Inc.
    Inventors: David Glenn Black, Gregory Walter Haggquist, Dat Quoc Nguyen
  • Patent number: 6022657
    Abstract: Methods of making a charge generation layer comprise premixing a charge generation compound, a charge transport compound and solvent to form a premix essentially free of polymeric binder, mixing the premix with at least one polymeric binder to form a dispersion, and coating the dispersion on a substrate. Photoconductors comprising a substrate, a charge transport layer and a charge generation layer formed by such a method exhibit improved electrical sensitivity.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: February 8, 2000
    Assignee: Lexmark International, Inc.
    Inventors: Sterritt R. Fuller, Jr., Gregory Walter Haggquist, Laura Lee Kierstein, Ronald Harold Levin, Scott Thomas Mosier, Jennifer Kaye Neely, Catherine Mailhe Randolph
  • Patent number: 5923122
    Abstract: An electrodeless lamp comprises an envelope containing a fill and a substance for facilitating the starting of the lamp. An outer tube is secured to an outside portion of the envelope in proximity to the given region and an inner tube is disposed within the outer tube such that a fluid passageway is defined between an inner surface of the outer tube and an outer surface of the inner tube. A hollow retractable electrode is provided within the inner tube, the electrode having a first position in which its tip portion is in proximity to the given region of the envelope when the lamp is being started and a second position in which the tip portion is away from the envelope after the lamp is started. A source of cooling fluid is operably connected to the hollow electrode such that the cooling fluid is forced through the hollow electrode and exhausted through the fluid passageway.
    Type: Grant
    Filed: April 8, 1998
    Date of Patent: July 13, 1999
    Assignee: Fusion UV Systems, Inc.
    Inventors: Jerome D. Frank, Gregory Walter, Pedro Lezcano, Miodrag Cekic