Patent US2452085A successfully refreshed from Google Patents.
US2452085A
Expired / Lapsed
US
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Means for the interchange of electrical and acoustical energy
Assignee: Submarine Signal Co
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Filing: 1942-08-06
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Granted: 1948-10-26
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Expires: 1962-08-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Edwin E Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:55
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/08; H; H04; H04R; H04R15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2384465A
Cited
US1495429A
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US1788402A
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US1985251A
Cited
US2076330A
Cited
US2116522A
Cited
US2051200A
Cited
DE620484C
Cited
US2088324A
Cited
US2190666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |