US3346067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for determining acoustic reflection coefficients
Assignee: AT&T Inc
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Filing: 1966-03-16
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Granted: 1967-10-10
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Expires: 1986-03-16
Abstract
No abstract record available.
Inventors
- 👤 Manfred R Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:22
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G01N29/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
APPARATUS WHICH COMPRISES MEANS FOR DIRECTING A PRESSURE WAVE TO BE INCIDENT UPON A REFLECTING MATERIAL; MEANS FOR SIMULTANEOUSLY MEASURING THE INSTANTANEOUS AMPLITUDES OF SAID INCIDENT PRESSURE WAVE AND THE PRESSURE WAVE REFLECTED FROM SAID MATERIAL; AND MEANS FOR DERIVING FROM SAID MEASURED AMPLITUDES THE REAL AND IMAGINARY PARTS OF THE COMPLEX REFLECTION COEFFICIENT OF SAID REFLECTING MATERIAL AT A SELECTED FREQUENCY.
Claim 2
Dependent Claim
62 words
APPARATUS WHICH COMPRISES MEANS FOR DIRECTING A PRESSURE WAVE TO BE INCIDENT UPON A REFLECTING MATERIAL; MEANS FOR SIMULTANEOUSLY MEASURING THE INSTANTANEOUS AMPLITUDES OF SAID INCIDENT PRESSURE WAVE AND THE PRESSURE WAVE REFLECTED FROM SAID MATERIAL; AND MEANS FOR DERIVING FROM SAID MEASURED AMPLITUDES THE REAL AND IMAGINARY PARTS OF THE COMPLEX REFLECTION COEFFICIENT OF SAID REFLECTING MATERIAL AT A SELECTED FREQUENCY.
References Cited (Backward Citations)
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Cited
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US2394461A
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US2837914A
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US3057188A
Cited
US3030803A
Cited
US3288241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |