Protective breathing mask having a speaking diaphragm for close communication and an electroacoustic transducer system for indirect speech transmission from inside the mask
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 12, 1988
Grant Date -
N/A
app pub date -
Oct 23, 1985
filing date -
Oct 25, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully