US3521273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
First encoding stage for a stage by stage encoder
Assignee: AT&T Inc
•
Filing: 1966-12-01
•
Granted: 1970-07-21
•
Expires: 1986-12-01
Abstract
No abstract record available.
Inventors
- 👤 Veikko R Saari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:00
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/34; H03M1/38; H03M1/44; H03M1/445
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3076901A
Cited
US3130325A
Cited
US3035258A
Cited
US3145377A
Cited
US3187325A
Cited
US3311835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |