Patent US1813542A successfully refreshed from Google Patents.
US2705795A
Expired / Lapsed
US
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Data transmission system
Assignee: Individual
•
Filing: 1949-07-06
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Granted: 1955-04-05
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Expires: 1969-07-06
Abstract
No abstract record available.
Inventors
- 👤 Fisk Bert
- 👤 Charles L Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:56
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1886188A
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US2048081A
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US2159790A
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US2273193A
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US2465355A
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US2369662A
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US2459117A
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US2531817A
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US2492062A
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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) | 1958-04-04 | 1958-10-04 | 1959-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-04 | 1962-10-04 | 1963-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-04 | 1966-10-04 | 1967-04-05 | $7700.00 | Window Closed / Lapsed |