Patents by Inventor Daniel Doyen

Daniel Doyen 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).

  • Ultrahigh-frequency oscillator having a dielectric resonator stable with respect to mechanical vibrations
    Patent number: 4873495
    Abstract: An ultrahigh-frequency oscillator (10) stabilized by a dielectric resonator (20) comprising a housing (11) closed by a cover (12) and having a circuit (13) including a dielectric resonator (20) fixed in the bottom (14) of the housing (11). According to the invention, a small column (30) situated in the central part (15) of the housing (11) rigidly connects the bottom (14) of the housing (11) to the cover (12), the dielectric resonator (20) being arranged outside the said central part (15).
    Type: Grant
    Filed: August 30, 1988
    Date of Patent: October 10, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Daniel Doyen, Tarcisio Vriz
  • Microwave oscillator comprising a dielectric resonator insensitive to mechanical vibrations
    Patent number: 4710729
    Abstract: A microwave oscillator (11) stabilized by a dielectric resonator (12) constituted by a housing (13) accommodating the dielectric resonator circuit and haing a fixing surface (14) and by a support (15) having an outer surface (16) on which the housing (13) is secured. The interface between the housing (13) and the support (15) has space-defining means (17,18,19) such that the housing (13) is subjected to flexural strain when fixed by its fixing surface (14) on the other surface (16) of the support (15).
    Type: Grant
    Filed: September 2, 1986
    Date of Patent: December 1, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Daniel Doyen, Tarcisio Vriz
  • Magnetic circuit for an yttrium-iron garnet crystal resonator for an oscillator
    Patent number: 4516096
    Abstract: Magnetic circuit for an yttrium-iron garnet crystal (11) resonator for an oscillator, formed by a first cylindrical pole piece (12) comprising a coil (13) provided around an axial core (14) and a second cylindrical pole piece (15) having a flat bottom (16), the yttrium-iron garnet crystal (11) being placed in a gap (17) defined by an end (18) of the axial core (14) and the part (19) of the flat bottom facing the end (18). According to the invention, a circular groove (20) is arranged in the flat bottom (16) around the part (19) facing the end (18) of the axial core (14).
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: May 7, 1985
    Assignee: U.S. Philips Corporation
    Inventor: Daniel Doyen
  • Process for continuous production of trinitrotoluene
    Patent number: 4022844
    Abstract: An improved process for the continuous production of trinitrotoluene by dinitrating and trinitrating mononitrotoluene in the presence of concentrated nitric acid and concentrated sulphuric acid or fuming sulphuric acid, which is characterised in that the trinitration step is carried out in a group of pieces of equipment in which the reagents flow in co-current, this group comprising at least two stages, each stage having at least two nitration reactors in series followed by a separator and the first of the reactors in each stage being supplied separately with a mixture of concentrated sulphuric acid or fuming sulphuric acid and nitric acid.Installations for carrying out this process are also disclosed.
    Type: Grant
    Filed: February 20, 1973
    Date of Patent: May 10, 1977
    Assignee: Societe Nationale des Poudres et Explosifs
    Inventors: Hubert E. de Cazenove, Daniel Doyen, Jacques M. Dussidour, Jean-Jacques Gautier