US2721229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal transmitting photoelectric reader
Assignee: International Business Machines Corp
•
Filing: 1951-12-22
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Granted: 1955-10-18
•
Expires: 1971-12-22
Abstract
No abstract record available.
Inventors
- 👤 Clyde J Fitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:24
CPC Classifications
H; H04; H04L; H04L17/00; H04L17/02; H04L17/12; H04L17/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1753961A
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US2274737A
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US2307099A
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US2380666A
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US2382251A
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US2468462A
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US2592779A
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US2586711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |