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US3393400A
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Calibration method using transducer array with constant pressure plane wave near-field
Assignee: United States Department of the Navy
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Filing: 1967-09-29
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Granted: 1968-07-16
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Expires: 1987-09-29
Abstract
No abstract record available.
Inventors
- 👤 Winfield J Trott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:13
CPC Classifications
H; H04; H04R; H04R29/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2999225A
Cited
US3257839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-16 | 1972-01-15 | 1972-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-16 | 1976-01-15 | 1976-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-16 | 1980-01-15 | 1980-07-16 | $7700.00 | Window Closed / Lapsed |