Patent US2544508A successfully refreshed from Google Patents.
US2544508A
Expired / Lapsed
US
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Signal transfer apparatus
Assignee: RCA Corp
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Filing: 1948-03-26
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Granted: 1951-03-06
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Expires: 1968-03-26
Abstract
No abstract record available.
Inventors
- 👤 Mackey Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:20
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1715560A
Cited
US2111490A
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US2144029A
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US2181982A
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US2158255A
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US2163051A
Cited
US2192991A
Cited
US2435630A
Cited
GB747754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |