US3524015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Response system for television
Assignee: JOHN O CAMPBELL
•
Filing: 1966-08-31
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Granted: 1970-08-11
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Expires: 1986-08-31
Abstract
No abstract record available.
Inventors
- 👤 John O Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:36
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/173; H04N7/17309; H04N21/00; H04N21/20; H04N21/25; H04N21/254; H04N21/2543; H04N21/258; H04N21/25866; H04N21/25891; H04N21/40; H04N21/41; H04N21/422; H04N21/42203; H04N21/426; H04N21/42684; H04N21/47; H04N21/475; H04N21/4758
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |