US3459894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic comb filter
Assignee: AT&T Inc
•
Filing: 1966-03-03
•
Granted: 1969-08-05
•
Expires: 1986-03-03
Abstract
No abstract record available.
Inventors
- 👤 Robert C Hoyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:25
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/20; H04B3/21; G; G01; G01R; G01R23/00; H03; H03H; H03H19/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3021478A
Cited
US2729698A
Cited
US3026475A
Cited
US3020399A
Cited
US2996667A
Cited
US3175051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |