Patent US5081441A successfully refreshed from Google Patents.
US5081441A
Expired / Lapsed
US
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Hand-held tone generator for equalizing binaural hearing aids
Assignee: STARKEY LABORATORIES Inc 6700 WASHINGTON AVE SOUTH EDEN PRAIRIE MN 55344 A CORP OF
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Filing: 1990-10-30
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Granted: 1992-01-14
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Expires: 2010-10-30
Abstract
Abstract Audible tone generators, particularly a hand-held tone generator for generating an audible tone as a test for equalizing binaural hearing aids. The circuit is characterized by its "fountain pen" size, as well as its extreme simplicity and reliability.
Inventors
- 👤 Sunil Chojar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:52
CPC Classifications
G; G08; G08B; G08B3/00; G08B3/10; A; A61; A61B; A61B5/00; A61B5/12; H; H04; H04R; H04R25/00; H04R25/30; A61B2560/00; A61B2560/04; A61B2560/0406; A61B2560/0418; A61B2560/0462; H04R25/55; H04R25/552
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
A tone generator comprising: a. An elongated housing; b. A hood supported upon an end of said housing, including a speaker aperture; c. A tone generator circuit supported within the hood including: i. a socket adapted for connection to a source of electrical power; ii. a plurality of operational amplifiers whose balance is maintained by resistor and capacitor elements, and iii. a speaker fitted within the speaker aperture; d. the source of electrical power supported within said housing and connected to said tone generator circuit via said socket, and e. an on/off switch in the form of a resilient clip supported on the outside of said housing and interconnecting said source of electrical power and said socket.
Claim 2
Dependent Claim
117 words
A tone generator comprising: a. An elongated housing; b. A hood supported upon an end of said housing, including a speaker aperture; c. A tone generator circuit supported within the hood including: i. a socket adapted for connection to a source of electrical power; ii. a plurality of operational amplifiers whose balance is maintained by resistor and capacitor elements, and iii. a speaker fitted within the speaker aperture; d. the source of electrical power supported within said housing and connected to said tone generator circuit via said socket, and e. an on/off switch in the form of a resilient clip supported on the outside of said housing and interconnecting said source of electrical power and said socket.
Claim 3
Dependent Claim
18 words
A tone generator as in claim 1, including a perforated screen fitted within said hood adjacent said speaker.
Claim 4
Dependent Claim
30 words
A tone generator as in claim 2, said tone generator circuit being in the form of a printed circuit board supported within said hood intermediate said socket and said speaker.
Claim 5
Dependent Claim
26 words
A tone generator as in claim 3, said operational amplifiers being united in four stages so as to provide a total gain of approximately 72 dB.
Claim 6
Dependent Claim
16 words
A tone generator as in claim 4, said circuit having a drain current of 0.45 mA.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |