Patents by Inventor Wolf-Dietrich Drews

Wolf-Dietrich Drews 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: 4912357
    Abstract: An ultrasonic MHz oscillator, in particular for liquid atomization, where at the upper, widening end of the upwardly decreasingly tapering amplitude transformer fastened on a planar piezoceramic disk, a continuously concave surface adapted to the liquid quantity and liquid surface tension is disposed comprising a concave mirror. The mirror cavity is adapted to receive the liquid to be atomized. With the oscillator, smallest droplets can be produced without coupling liquid, so that the oscillators find use above all in pocket inhalators.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: March 27, 1990
    Assignee: Siemens Aktiengesellschaft
    Inventors: Wolf-Dietrich Drews, Klaus Van der Linden
  • Patent number: 4877989
    Abstract: An ultrasonic pocket-size atomizer comprises a housing including a first portion and a second portion detachably connected thereto. A vibration generation mechanism is mounted liquid-tight in the first portion of the housing for generating an oscillation with a frequency between 1 and 5 Mhz. The vibration generation mechanism includes a piezoelectric assembly and an electronic circuit operatively connected to the assembly for energizing the assembly and causing the assembly to vibrate. A power source including a storage battery is removably and rechargeably disposed in the first portion of the housing for supplying electric current to the electronic circuit. A cartridge is provided for containing liquid to be atomized, the cartridge being movably disposed in the second portion of the housing.
    Type: Grant
    Filed: January 12, 1989
    Date of Patent: October 31, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventors: Wolf-Dietrich Drews, Klaus Van Der Linden, Martin Ruttel, Jurgen Friedrich
  • Patent number: 4119096
    Abstract: An inhalator is constructed with an outer housing and an inner protective housing. The outer housing includes an opening adapted to receive the anatomy of the nasal region. The outer housing also contains a reservoir for holding a supply of medicinal liquid. The inner housing contains and protects an oscillator which energizes an electromechanical transducer, the transducer extending through a wall of the protective housing in sealed relation thereto and carrying a vibratory atomizing member which is positioned to receive liquid from the reservoir. The oscillator includes a position sensitive on-off switch which permits operation only when the inhalator is in a predetermined orientation. A droplet shield is positioned forward of the atomizing member, between the atomizing member and the opening in the outer housing so that liquid droplets of the aerosol and respiration moisture precipitate thereon and run off along a path over which the droplets will not strike the atomizing member.
    Type: Grant
    Filed: August 24, 1976
    Date of Patent: October 10, 1978
    Assignee: Siemens Aktiengesellschaft
    Inventor: Wolf-Dietrich Drews
  • Patent number: 3970250
    Abstract: An ultrasonic liquid atomizer of the type having an piezoelectric vibrating system with the vibrations from an piezoelectric transducer being transmitted to an atomizer plate through conical members wherein the atomizer plate is positioned interiorly of a chamber defining member adjacent a discharged orifice and blower means are positioned to induce an air flow through the chamber defining member past the atomizer plate to the orifice providing a jet-like flow past the atomizer plate periphery.
    Type: Grant
    Filed: September 24, 1975
    Date of Patent: July 20, 1976
    Assignee: Siemens Aktiengesellschaft
    Inventor: Wolf-Dietrich Drews