US3525807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone-television substation apparatus
Assignee: AT&T Inc
•
Filing: 1967-07-25
•
Granted: 1970-08-25
•
Expires: 1987-07-25
Abstract
No abstract record available.
Inventors
- 👤 Donald R Herriott
- 👤 Kenneth M Poole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:32
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/14; H04N7/141; H04N7/142; H04N13/00; H04N13/30; H04N13/302
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2260228A
Cited
US2878310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |