US3160708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic stethoscope
Assignee: Texas Instruments Inc
•
Filing: 1961-07-13
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Granted: 1964-12-08
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Expires: 1981-07-13
Abstract
No abstract record available.
Inventors
- 👤 Francis M Andries
- 👤 John L Center
- 👤 Gordon J Rabalais
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:46
CPC Classifications
A; A61; A61B; A61B7/00; A61B7/02; A61B7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
SOUND-DETECTING APPARATUS COMPRISING A CONE-SHAPED BELL BEING OPEN AT THE WIDE END, A HOLLOW CHAMBER POSITIONED ADJACENT TO AND AXIALLY ALIGNED WITH SAID BELL, SAID CHAMBER HAVING AN OPENING COMMUNICATING WITH THE SMALL END OF SAID BELL, A THIN FLEXIBLE DIAPHRAGM HAVING A DIAMETER APPROXIMATING THAT OF SAID WIDE END OF SAID BELL AND POSITIONED WITHIN SAID CHAMBER CLOSELY ADJACENT SAID OPENING, SAID DIAPHRAGM SEPARATING A SMALL PORTION OF SAID CHAMBER FROM THE REMAINDER THEREOF, A FIRST NARROW AIR PASSAGE CONNECTING SAID SMALL PORTION TO ATMOSPHERE, A SECOND NARROW AIR PASSAGE CONNECTING SAID REMAINING PORTION OF SAID CHAMBER TO ATMOSPHERE, A COIL SECURED TO SAID FLEXIBLE DIAPHRAGM AND POSITIONED IN A MAGNETIC FIELD, AND AMPLIFYING MEANS HAVING AN INPUT CONNECTED TO SAID COIL.
Claim 2
Dependent Claim
123 words
SOUND-DETECTING APPARATUS COMPRISING A CONE-SHAPED BELL BEING OPEN AT THE WIDE END, A HOLLOW CHAMBER POSITIONED ADJACENT TO AND AXIALLY ALIGNED WITH SAID BELL, SAID CHAMBER HAVING AN OPENING COMMUNICATING WITH THE SMALL END OF SAID BELL, A THIN FLEXIBLE DIAPHRAGM HAVING A DIAMETER APPROXIMATING THAT OF SAID WIDE END OF SAID BELL AND POSITIONED WITHIN SAID CHAMBER CLOSELY ADJACENT SAID OPENING, SAID DIAPHRAGM SEPARATING A SMALL PORTION OF SAID CHAMBER FROM THE REMAINDER THEREOF, A FIRST NARROW AIR PASSAGE CONNECTING SAID SMALL PORTION TO ATMOSPHERE, A SECOND NARROW AIR PASSAGE CONNECTING SAID REMAINING PORTION OF SAID CHAMBER TO ATMOSPHERE, A COIL SECURED TO SAID FLEXIBLE DIAPHRAGM AND POSITIONED IN A MAGNETIC FIELD, AND AMPLIFYING MEANS HAVING AN INPUT CONNECTED TO SAID COIL.
References Cited (Backward Citations)
FR821374A
Cited
US2419471A
Cited
US2755336A
Cited
US2777903A
Cited
US2827514A
Cited
US3087016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-08 | 1968-06-08 | 1968-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-08 | 1972-06-08 | 1972-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-08 | 1976-06-08 | 1976-12-08 | $7700.00 | Window Closed / Lapsed |