US3517131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for superimposing individual channel spectra in a noninterfering manner
Assignee: AT&T Inc
•
Filing: 1967-04-10
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Granted: 1970-06-23
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Expires: 1987-04-10
Abstract
No abstract record available.
Inventors
- 👤 Floyd K Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:51
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/02; H04L5/06; H04B; H04B14/00; H04B14/002; H04B14/004; H04L27/00; H04L27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2188499A
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US2617036A
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US2565409A
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US2776373A
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US2905812A
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US3163718A
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US3290440A
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US3349182A
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US3364311A
Cited
US3430143A
Cited
US3379992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |