Patents Represented by Attorney T. J. Anderson
  • Patent number: 3974796
    Abstract: A powder cloud development apparatus is provided for developing latent electrostatic images on the surface of an insulating member, normally a photoconductive layer, employing a powder cloud development system. The development apparatus is operable in either a positive or negative mode and includes a development electrode comprising a plurality of spaced substantially parallel wires, a gap, or open section, which is formed between selected groups of these wires, the wires being connected at each end to a continuous loop drive mechanism. The parallel wires therefore or the gap may either be presented in operable relationship to the surface of the insulating member in order to provide either electroded or non-electroded development in the negative and positive modes respectively.
    Type: Grant
    Filed: November 21, 1974
    Date of Patent: August 17, 1976
    Assignee: Xerox Corporation
    Inventors: Gerald J. Murray, Jr., Gordon U. Klingenberg
  • Patent number: 3974905
    Abstract: A key arm mechanism for keys of a typewriter or data entry device in which a uniform spring rate is achieved by varying the cross-sectional area of the key arms as a direct relation to the distance of the key support posts from a cantilever point. The entire key arm mechanism is formed of a unitary molded material. In one embodiment, the cross-sectional area of each key arm is uniform from the cantilever point to its associated key support post. In another embodiment, the cross-sectional area of each key arm decreases linearly from the cantilever point to its associated key support post. Uniform initial preload tension can be applied to the key arms by a slotted member which engages the ends of the key arms remote from the cantilever points. Non-uniform preload tension can be achieved by varying the height of some slots of the slotted member or by varying the height of the key arms at the ends thereof remote from the cantilever points.
    Type: Grant
    Filed: September 23, 1974
    Date of Patent: August 17, 1976
    Assignee: Xerox Corporation
    Inventor: Wendell C. Johnson
  • Patent number: 3971950
    Abstract: A mammographic compression and positioning device which is independent of the x-ray system utilized to produce images of an object being examined. A slide assembly is movable along a vertical post member which is adjustably secured to a base member. A compression paddle is coupled to the slide assembly and has a curved lower surface which, upon contacting the object, exerts a variable compressive force thereon. The position of the compression paddle is adjustable in a plurality of directions, allowing the paddle to be exactly positioned whereby an image of a selected object view may be obtained. The compression paddle is transparent enabling the user of the device to visualize the object being compressed and to take the steps necessary to provide initial image results which are satisfactory thereby reducing the number of reimages which normally would be required.
    Type: Grant
    Filed: April 14, 1975
    Date of Patent: July 27, 1976
    Assignee: Xerox Corporation
    Inventors: David T. Evans, Ellen M. Proctor, Frank R. Brion, Theodorus M. Ceelen
  • Patent number: 3952798
    Abstract: A heat pipe is provided with an internally positioned heat source.
    Type: Grant
    Filed: August 31, 1970
    Date of Patent: April 27, 1976
    Assignee: Xerox Corporation
    Inventors: Dean L. Jacobson, Randolph W. Hamerdinger
  • Patent number: 3947390
    Abstract: A switching plate having a plurality of arch-shaped snap-type switching members formed in a continuous metallic sheet or from sections of a metallic sheet bonded to an insulating substrate. Adjacent of the switching members extend in transverse directions. The switching members will snap downward when forced sufficiently downward thereby achieving contact or capacitive switching.The switching members are formed in a metallic sheet by providing a first plurality of groups of parallel slots in one direction and a second plurality of groups of parallel slots in a transverse direction, one of the slots of the first group being longer than the other slots. The sheet is placed in a die having members conforming in shape to the desired arches, wherein the sheet is deformed elastically at desired locations to provide the arch-shaped snap-type switching members.
    Type: Grant
    Filed: September 23, 1974
    Date of Patent: March 30, 1976
    Assignee: Xerox Corporation
    Inventor: Wendell C. Johnson
  • Patent number: 3940574
    Abstract: Reproducing the information stored in the spiral track of a record-type information-bearing disc is achieved by uniformly charging the surface of the disc by means of a corona-generating device disposed in proximity to the disc, and, thereafter, using a conductive stylus riding in the track of the disc to pick up the charge from only the peak points of the track. All peaks are at the same height. The system preferably uses FM encoding, and the information is carried by the track according to the peak-to-peak spacing. The stylus is shaped in relation to the track such that it may not touch the peaks in the track. The stylus contacts the sides of the track for tracking purposes. An air breakdown between the peaks and the metallic portion of the stylus results in the signal picked up by the stylus.
    Type: Grant
    Filed: December 20, 1973
    Date of Patent: February 24, 1976
    Assignee: Xerox Corporation
    Inventor: Leland Dale Green
  • Patent number: 3938881
    Abstract: An acousto-optic modulation device is provided which is comprised of an interaction material of an injection moulded plastic integrally combined with a transducer which is bonded automatically to the interaction material during the injection process. A beam of light is projected through the interaction material, the light being diffracted by an acoustic field established by the transducer.
    Type: Grant
    Filed: November 25, 1974
    Date of Patent: February 17, 1976
    Assignee: Xerox Corporation
    Inventors: David K. Biegelsen, Gary K. Starkweather, James C. Zesch
  • Patent number: 3934182
    Abstract: Synchronizing apparatus is disclosed in accordance with the teachings of the present invention wherein the operation of a first device is regulated in accordance with the operation of a second device. The phase relationship between signals representing the operation of the first and second devices, respectively, is determined by comparison means which produces a pulse width modulated signal indicative of said phase relationship. Control signal generating means responds to the pulse width modulated signal to generate an analog signal having an amplitude established by said phase relationship. Feedback means, including variable frequency generating means, is controlled by the analog signal to modify the operation of the first device whereby said first device is urged into a synchronous relationship with said second device and the signals representative of the operation of said first and second devices admit of a desired phase relationship.
    Type: Grant
    Filed: November 16, 1970
    Date of Patent: January 20, 1976
    Assignee: Xerox Corporation
    Inventors: James M. Donohue, Joseph R. Kramer, Victor Rodek