US2748882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-acoustic transducers
Assignee: International Standard Electric Corp
•
Filing: 1951-10-08
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Granted: 1956-06-05
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Expires: 1971-10-08
Abstract
No abstract record available.
Inventors
- 👤 Skelton Dennis Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:37
CPC Classifications
H; H04; H04R; H04R21/00; H04R21/02; H04R21/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1815987A
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GB425186A
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US2162270A
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US2345078A
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US2351400A
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US2609458A
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US2520646A
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US2646853A
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US2540498A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |