US3287506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor-based electro-acoustic transducer
Assignee: Siemens and Halske AG
•
Filing: 1964-12-14
•
Granted: 1966-11-22
•
Expires: 1984-12-14
Abstract
No abstract record available.
Inventors
- 👤 Hahnlein Alfons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:08
CPC Classifications
H; H04; H04R; H04R23/00; H04R23/006; H10; H10D; H10D99/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A SEMICONDUCTOR-BASED ELECTROACOUSTIC TRANSDUCER COMPRISING A HIGH-RESISTIVITY SEMICONDUCTOR BLOCK HAVING A SOURCE ELECTRODE AND A SINK ELECTRODE SPACED APART THEREON, THE SEMICONDUCTOR HAVING A SPATIALLY LIMITED VARIABLE CROSS SECTION CURRENT CHANNEL IN THE SEMICONDUCTOR SURFACE SERVING AS A CURRENT PATH BETWEEN SAID ELECTRODES, A PIEZOELECTRIC CRYSTAL SO MOUNTED ADJACENT THE INVERSION ZONE THAT ELECTROSTATIC INDUCTION CAUSES DIRECT INTERACTION BETWEEN THE SIZE OF SAID CURRENT CHANNEL AND THE ELECTRIC FIELD OF THE PIEZOELECTRIC CRYSTAL, AND SOUND TRANSLATING MEANS CONNECTED TO SAID CRYSTAL AND OPERABLE TO DO ONE OF: (A) TRANSLATE SOUND VIBRATIONS INTO FORCE VARIATIONS EXERTED ON SAID CRYSTAL; AND, (B) TRANSLATE VARIATIONS IN THE SIZE OF SAID CURRENT CHANNEL INTO SOUND VIBRATIONS.
Claim 2
Dependent Claim
112 words
A SEMICONDUCTOR-BASED ELECTROACOUSTIC TRANSDUCER COMPRISING A HIGH-RESISTIVITY SEMICONDUCTOR BLOCK HAVING A SOURCE ELECTRODE AND A SINK ELECTRODE SPACED APART THEREON, THE SEMICONDUCTOR HAVING A SPATIALLY LIMITED VARIABLE CROSS SECTION CURRENT CHANNEL IN THE SEMICONDUCTOR SURFACE SERVING AS A CURRENT PATH BETWEEN SAID ELECTRODES, A PIEZOELECTRIC CRYSTAL SO MOUNTED ADJACENT THE INVERSION ZONE THAT ELECTROSTATIC INDUCTION CAUSES DIRECT INTERACTION BETWEEN THE SIZE OF SAID CURRENT CHANNEL AND THE ELECTRIC FIELD OF THE PIEZOELECTRIC CRYSTAL, AND SOUND TRANSLATING MEANS CONNECTED TO SAID CRYSTAL AND OPERABLE TO DO ONE OF: (A) TRANSLATE SOUND VIBRATIONS INTO FORCE VARIATIONS EXERTED ON SAID CRYSTAL; AND, (B) TRANSLATE VARIATIONS IN THE SIZE OF SAID CURRENT CHANNEL INTO SOUND VIBRATIONS.
References Cited (Backward Citations)
US2898477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |