US3496479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable,real time,frequency inverse filtering system and method
Assignee: AT&T Inc
•
Filing: 1967-07-03
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Granted: 1970-02-17
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Expires: 1987-07-03
Abstract
No abstract record available.
Inventors
- 👤 Alan H Macpherson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:11
CPC Classifications
H; H03; H03H; H03H19/00; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2627574A
Cited
US3242462A
Cited
US3341779A
Cited
US3356947A
Cited
US3412338A
Cited
US3390336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |