Patent US2928903A successfully refreshed from Google Patents.
US2928903A
Expired / Lapsed
US
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Switching system and translator therefor
Assignee: TDK Micronas GmbH
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Filing: 1954-03-15
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Granted: 1960-03-15
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Expires: 1974-03-15
Abstract
No abstract record available.
Inventors
- 👤 John I Bellamy
- 👤 Theron L Bowers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:34
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2108140A
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US2227488A
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US2201573A
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US2268397A
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US2409063A
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US2342279A
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US2375136A
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US2392089A
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US2678353A
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US2713681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |