Patent US2549872A successfully refreshed from Google Patents.
US2549872A
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US
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Focusing ultrasonic radiator
Assignee: AT&T Inc
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Filing: 1948-03-26
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Granted: 1951-04-24
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Expires: 1968-03-26
Abstract
No abstract record available.
Inventors
- 👤 Gerald W Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:16
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2248870A
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US2374637A
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DE654673C
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US2323030A
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US2399820A
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US2438936A
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US2447061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |