Patents by Inventor Helmut Ryback

Helmut Ryback 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).

  • Protective breathing mask having a speaking diaphragm for close communication and an electroacoustic transducer system for indirect speech transmission from inside the mask
    Patent number: 4756308
    Abstract: A protective breathing mask, in addition to having a speaking diaphragm for close communication is equipped with an electroacoustic transducer system for indirect speech transmission from inside the mask. In order to achieve high transmission quality for human speech with a simple apparatus without the occurrence of interference noise, it is provided that the sound output channel is closed on the mask side by an auxiliary diaphragm which is acoustically coupled with the speaking diaphragm via a secondary air chamber, and is also mechanically connected directly or indirectly with a movable element of the electroacoustic transducer system.
    Type: Grant
    Filed: October 23, 1985
    Date of Patent: July 12, 1988
    Assignee: AKG Akustische u.Kino-Gerate Gesellschaft m.b.H.
    Inventor: Helmut Ryback