Patent US3474253A successfully refreshed from Google Patents.
US3474253A
Expired / Lapsed
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Method and apparatus for optically detecting acoustic disturbances
Assignee: United States Department of the Navy
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Filing: 1966-06-02
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Granted: 1969-10-21
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Expires: 1986-06-02
Abstract
No abstract record available.
Inventors
- 👤 Bernard V Kessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:12
CPC Classifications
G; G01; G01H; G01H9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD OF DETECTING UNDERWATER COHERENT ACOUSTIC WAVES COMPRISING THE STEPS OF PROPAGATING A NARROW BEAM OF LIGHT THROUGH A WATER MEDIUM, DETECTING THE BRILLOUIN SCATTERED LIGHT ALONG THE FORWARD AXIS OF THE NARROW BEAM OF LIGHT, BEATING THE BRILLOUIN SCATTERED LIGHT WITH THE UNSCATTERED LIGHT TO PRODUCE BEAT FREQUENCIES, AND DISCRIMINATING THE COHERENT BEAT FREQUENCIES FROM INCOHERENT AND RANDOMLY OCCURING BEAT FREQUENCIES.
Claim 2
Independent Claim
63 words
A METHOD OF DETECTING UNDERWATER COHERENT ACOUSTIC WAVES COMPRISING THE STEPS OF PROPAGATING A NARROW BEAM OF LIGHT THROUGH A WATER MEDIUM, DETECTING THE BRILLOUIN SCATTERED LIGHT ALONG THE FORWARD AXIS OF THE NARROW BEAM OF LIGHT, BEATING THE BRILLOUIN SCATTERED LIGHT WITH THE UNSCATTERED LIGHT TO PRODUCE BEAT FREQUENCIES, AND DISCRIMINATING THE COHERENT BEAT FREQUENCIES FROM INCOHERENT AND RANDOMLY OCCURING BEAT FREQUENCIES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |