US3012098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone privacy
Assignee: AT&T Inc
•
Filing: 1941-11-22
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Granted: 1961-12-05
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Expires: 1961-11-22
Abstract
No abstract record available.
Inventors
- 👤 Robert R Riesz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:40
CPC Classifications
H; H04; H04K; H04K1/00; H04K1/04; H04B; H04B1/00; H04B1/66; H04B1/667
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) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |