Patents by Inventor David E. Stepner

David E. Stepner 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).

  • Patent number: 5347913
    Abstract: A bicycle pump which has a pivoting footpeg on which the user may stand to secure the pump against the ground. The pump has a pivoting handle which includes a spring which forces apart the base and handle of the pump so that the pump can be secured in tension on a bicycle frame.
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: September 20, 1994
    Inventor: David E. Stepner
  • Patent number: 5138368
    Abstract: A hard copy such as a printed wiring board is fabricated by exposing to radiation a liquid crystal cell in which a desired pattern is written and directing the pattern-carrying radiation projected from the cell by transmission or reflection to a substrate which is coated with a material sensitive to the radiation and disposed alignedly at an exposure position by optical registration. The duration of the exposure is controlled for a given light intensity and for the type of the coating material. A pattern may be written in one cell substantially simultaneously as another cell is used for the projection imaging. After a produced pattern is compared with a reference pattern, corrections may be effected through a processor which controls the writing of a pattern in a cell.
    Type: Grant
    Filed: March 1, 1989
    Date of Patent: August 11, 1992
    Assignee: Greyhawk Systems, Inc.
    Inventors: Frederic J. Kahn, Neil G. Bergstrom, David E. Stepner
  • Patent number: 5085506
    Abstract: An image projection apparatus in which an image object plane contains a plurality of reflecting images and a light source and optical system projects a beam on each of said plurality of images. Spaced projection lenses are positioned to receive the light reflected from the images and direct the light on a projection surface with the plurality of reflected images in coregistration.
    Type: Grant
    Filed: November 6, 1990
    Date of Patent: February 4, 1992
    Assignee: Greyhawk Systems, Inc.
    Inventors: Frederic J. Kahn, Paul N. Kendrick, Jerry Leff, Linden J. Livoni, Bryan E. Loucks, David E. Stepner, Kenneth G. Witte
  • Patent number: 4969734
    Abstract: An image projection apparatus in which an image object plane contains a plurality of reflecting images and a light source and optical system projects a beam on each of said plurality of images. Spaced projection lenses are positioned to receive the light reflected from the image and direct the light on a projection surface with the plurality of reflected images in coregistration.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: November 13, 1990
    Assignee: Greyhawk Systems, Inc.
    Inventors: Frederic J. Kahn, Paul N. Kendrick, Jerry Leff, Linden J. Livoni, Bryan E. Loucks, David E. Stepner, Kenneth G. Witte
  • Patent number: 4818098
    Abstract: An apparatus for projecting high precision optical images with a selective heating source, advantageously a laser, on a writable, erasable, editable electronic slide and simultaneously or sequentially projecting the images in registration, onto a receiving surface such as a projection screen or photosensitive material, in the former case for the purpose of displaying the projected image and in the latter case for the purpose of creating a hard copy of the projected image.
    Type: Grant
    Filed: May 9, 1986
    Date of Patent: April 4, 1989
    Assignee: Sharp Corporation
    Inventors: Frederic J. Kahn, Paul N. Kendrick, Jerry Leff, Linden J. Livoni, Bryan E. Loucks, David E. Stepner, Kenneth G. Witte
  • Patent number: 4424813
    Abstract: A multi-mode scanner head employing split (semicircular transducers) is described. In some modes such as simultaneous B-scan and M-scan each transducer moves independent of the other. For continuous Doppler mode the transducers move together. The relatively small, hand-held scanner head is particularly useful for cardiac examinations.
    Type: Grant
    Filed: August 14, 1981
    Date of Patent: January 10, 1984
    Assignee: Diasonics, Inc.
    Inventors: James F. Havlice, Albert S. Waxman, Henry L. Schwartz, David E. Stepner
  • Patent number: 3961425
    Abstract: An automatic temperature control system for a textile tenter frame having an oven section for heating the fabric in order to "set" its fibers in an essentially non-shrinkable state. The system operates to maximize the speed of the tenter frame while maintaining optimum heat set conditions. Fabric temperature from within the oven and initial moisture content data are furnished to a computer and processed with time-at-temperature target inputs to provide tenter frame speed control output signals.
    Type: Grant
    Filed: June 18, 1975
    Date of Patent: June 8, 1976
    Assignee: Measurex Corporation
    Inventors: S. Keith Swanson, David E. Stepner