Patent US3403234A successfully refreshed from Google Patents.
US3403234A
Expired / Lapsed
US
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Acoustic transducer
Assignee: Northrop Grumman Corp
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Filing: 1964-09-11
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Granted: 1968-09-24
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Expires: 1984-09-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Roswell P Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:39
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/04; G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/24; G01G; G01G3/00; G01G3/12; G01G3/16; G01L; G01L1/00; G01L1/14; G01L5/00; G01L5/14; H04R19/02
Claims Analysis
Total Claims: 0
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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) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |