Patents by Inventor Robert M. Hulle

Robert M. Hulle 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).

  • Method of forming an optical grating
    Patent number: 4034460
    Abstract: An optical grating having expansion characteristics equivalent to the thermal expansion characteristics of a preselected material is formed by providing a thin grating sheet of a material different from the preselected material, forming spaced slits in the sheet to overly an opening in an underlying plate of such preselected material, thereafter securing the sheet to the plate along narrow zones outside the opening, and finally removing the portions of the sheet lying outside such zones.
    Type: Grant
    Filed: November 17, 1975
    Date of Patent: July 12, 1977
    Assignee: Trans-Cal Industries, Inc.
    Inventors: Robert M. Hulle, John Ferrero, Gerard Pannullo
  • Encoder for altimeters and the like instruments
    Patent number: RE29436
    Abstract: An inexpensive, compact and yet highly accurate instrument for transmitting coded signals representing altitudes at which an aircraft is flying, the instrument comprising an altitude sensing unit and a separate encoding unit operatively connected to the sensing unit with means for finely and precisely adjusting the encoding unit relative to the altitude sensing unit.
    Type: Grant
    Filed: March 31, 1976
    Date of Patent: October 11, 1977
    Assignee: Trans-Cal Industries, Inc.
    Inventors: Robert M. Hulle, John Ferrero, Gerald Pannullo