Patents by Inventor John R. Colbert

John R. Colbert 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).

  • Piezoelectric transducer having a crystal orientation selected from (xyl) + 31.7.degree. (.+-.1.degree.) and (xyl) + 76.7.degree. (.+-.1.degree.) or symmetrical equivalent
    Patent number: RE29755
    Abstract: A lithium niobate piezoelectric single crystal transducer having selected rotational orientations with respect to X, Y and Z rectangular coordinate axes. Compressional mode accelerometers having low or zero shear and torsion sensitivity are provided in which the crystal is oriented, in IRE notation, as (a) a (yxl) +38.6.degree. cut or symmetrical equivalents thereof, such as (zxl) (b) a +60.degree./+51.4.degree. cut. Shear mode accelerometers having low or zero compression sensitivity are provided in which the crystal is oriented, in IRE notation, as (a) (xyl) +31.7.degree. cut, or symmetrical equivalents, and (b) an (xyl) +76.7.degree. cut.
    Type: Grant
    Filed: April 25, 1977
    Date of Patent: September 5, 1978
    Assignee: Bell & Howell Company
    Inventors: George D. Perkins, John R. Colbert