Patent US2521353A successfully refreshed from Google Patents.
US2521353A
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US
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Transmitter
Assignee: International Business Machines Corp
•
Filing: 1945-11-27
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Granted: 1950-09-05
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Expires: 1965-11-27
Abstract
No abstract record available.
Inventors
- 👤 Clyde J Fitch
- 👤 Robert N Eichorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:21
CPC Classifications
H; H04; H04L; H04L17/00; H04L17/02; H04L17/04; H04L17/06; H04L25/00; H04L25/38; H04L25/40; H04L25/45
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1555870A
Cited
US2168198A
Cited
US2210574A
Cited
US2247167A
Cited
US2415944A
Cited
US2400574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |