发明授权
- 专利标题： Audible signaling device
- 专利标题（中）： 声音信号装置
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申请号： US12012695申请日： 2008-02-05
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公开(公告)号： US07880593B2公开(公告)日： 2011-02-01
- 发明人: Christopher M. Baldwin , Daniel O'Brien , Mark T. Monnett
- 申请人： Christopher M. Baldwin , Daniel O'Brien , Mark T. Monnett
- 申请人地址： US IN Indianapolis
- 专利权人： Mallory Sonalert Products, Inc.
- 当前专利权人： Mallory Sonalert Products, Inc.
- 当前专利权人地址： US IN Indianapolis
- 代理机构： Niro, Haller & Niro
- 主分类号： G10K9/20
- IPC分类号： G10K9/20
摘要：
The invention is an improved audible signaling device with a speaker, a sound chamber, and associated circuitry. The device creates a loud, audible fundamental frequency, and harmonic frequencies that are relatively equal in amplitude to the amplitude of the fundamental frequency.
公开/授权文献
- US20090195367A1 Audible signaling device 公开/授权日：2009-08-06
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