US3136867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic transducer
Assignee: Ampex Corp
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Filing: 1961-09-25
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Granted: 1964-06-09
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Expires: 1981-09-25
Abstract
No abstract record available.
Inventors
- 👤 George A Brettell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:20
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
AN ELECTROSTATIC TRANSDUCER ASSEMBLY COMPRISING A PLURALITY OF PARALLEL MOUNTED AND APERTURED RIGID PLATES; A SIMILAR PLURALITY, LESS ONE, OF FLEXIBLE DIAPHRAGMS RESPECTIVELY INTERLEAVED BETWEEN THE PLATES, THE DIAPHRAGMS BEING SUBSTANTIALLY COEXTENSIVE WITH AND PARALLEL TO THE PLATES; A TRANSFORMER HAVING A CENTER-TAPPED WINDING WITH TWO LEADS ALTERNATELY CONNECTED TO SUCCESSIVE ONES OF THE PLATES; A CENTER-TAPPED SOURCE OF BIAS HAVING TWO ELECTRODES OF OPPOSITE POLARITY WITH SUCCESSIVE DIAPHRAGMS BEING ALTERNATELY CONNECTED TO THE TWO ELECTRODES AND THE CENTER TAP OF THE SOURCE COUPLED TO THE CENTER TAP OF THE TRANSFORMER WINDING; AND A TRANSMISSION LINE HAVING A TIME CONSTANT MATCHING THE INHERENT MECHANICAL TIME CONSTANT OF THE PLATE AND DIAPHRAGM COMBINATIONS INCLUDED BETWEEN THE TWO TRANSFORMER LEADS AND THE SUCCESSIVE PLATES.
Claim 2
Dependent Claim
122 words
AN ELECTROSTATIC TRANSDUCER ASSEMBLY COMPRISING A PLURALITY OF PARALLEL MOUNTED AND APERTURED RIGID PLATES; A SIMILAR PLURALITY, LESS ONE, OF FLEXIBLE DIAPHRAGMS RESPECTIVELY INTERLEAVED BETWEEN THE PLATES, THE DIAPHRAGMS BEING SUBSTANTIALLY COEXTENSIVE WITH AND PARALLEL TO THE PLATES; A TRANSFORMER HAVING A CENTER-TAPPED WINDING WITH TWO LEADS ALTERNATELY CONNECTED TO SUCCESSIVE ONES OF THE PLATES; A CENTER-TAPPED SOURCE OF BIAS HAVING TWO ELECTRODES OF OPPOSITE POLARITY WITH SUCCESSIVE DIAPHRAGMS BEING ALTERNATELY CONNECTED TO THE TWO ELECTRODES AND THE CENTER TAP OF THE SOURCE COUPLED TO THE CENTER TAP OF THE TRANSFORMER WINDING; AND A TRANSMISSION LINE HAVING A TIME CONSTANT MATCHING THE INHERENT MECHANICAL TIME CONSTANT OF THE PLATE AND DIAPHRAGM COMBINATIONS INCLUDED BETWEEN THE TWO TRANSFORMER LEADS AND THE SUCCESSIVE PLATES.
References Cited (Backward Citations)
US1082248A
Cited
US1983377A
Cited
US1978200A
Cited
FR1083302A
Cited
US3008014A
Cited
GB838024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |