Patent US3133990A successfully refreshed from Google Patents.
US3133990A
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Automatic level-adjustment circuit
Assignee: Altec Lansing Corp
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Filing: 1962-04-27
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Granted: 1964-05-19
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Expires: 1982-04-27
Abstract
No abstract record available.
Inventors
- 👤 Edward S Seeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:03
CPC Classifications
H; H04; H04R; H04R27/00; H03; H03G; H03G3/00; H03G3/20; H03G3/22; H03G3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
IN A SOUND-AMPLIFICATION SYSTEM OF THE TYPE WHEREIN THE SOUND IS AMPLIFIED AND REPRODUCED BY A LOUDSPEAKER AND THERE IS INCLUDED APPARATUS FOR COMPENSATING FOR THE AMBIENT NOISE LEVEL IN THE VICINITY OF SAID SPEAKER INCLUDING MEANS FOR DETECTING THE NOISE AND PRODUCING A CONTROL SIGNAL IN RESPONSE THERETO, AND GAIN CONTROL MEANS FOR VARYING THE SOUND OUTPUT IN RESPONSE TO SAID CONTROL SIGNAL TO COMPENSATE FOR SAID AMBIENT NOISE LEVEL, THE IMPROVEMENT COMPRISING MEANS FOR DETECTING WHEN SAID SOUND SYSTEM IS BEING USED FOR SOUND AMPLIFICATION AND TO PRODUCE A CONTROL EFFECT RESPONSIVE THERETO, AND CONTROLLED MEANS TO MAINTAIN SAID GAIN CONTROL MEANS IN THE STATE IT HAD JUST PRIOR TO THE COMMENCEMENT OF THE USE OF SAID SYSTEM FOR AMPLIFYING SOUND, SAID CONTROLLED MEANS ALSO
Claim 2
Dependent Claim
127 words
IN A SOUND-AMPLIFICATION SYSTEM OF THE TYPE WHEREIN THE SOUND IS AMPLIFIED AND REPRODUCED BY A LOUDSPEAKER AND THERE IS INCLUDED APPARATUS FOR COMPENSATING FOR THE AMBIENT NOISE LEVEL IN THE VICINITY OF SAID SPEAKER INCLUDING MEANS FOR DETECTING THE NOISE AND PRODUCING A CONTROL SIGNAL IN RESPONSE THERETO, AND GAIN CONTROL MEANS FOR VARYING THE SOUND OUTPUT IN RESPONSE TO SAID CONTROL SIGNAL TO COMPENSATE FOR SAID AMBIENT NOISE LEVEL, THE IMPROVEMENT COMPRISING MEANS FOR DETECTING WHEN SAID SOUND SYSTEM IS BEING USED FOR SOUND AMPLIFICATION AND TO PRODUCE A CONTROL EFFECT RESPONSIVE THERETO, AND CONTROLLED MEANS TO MAINTAIN SAID GAIN CONTROL MEANS IN THE STATE IT HAD JUST PRIOR TO THE COMMENCEMENT OF THE USE OF SAID SYSTEM FOR AMPLIFYING SOUND, SAID CONTROLLED MEANS ALSO
References Cited (Backward Citations)
US2462532A
Cited
US2466216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |