US2884491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Message-waiting signal for telephone subscribers
Assignee: AT&T Inc
•
Filing: 1958-01-24
•
Granted: 1959-04-28
•
Expires: 1978-01-24
Abstract
No abstract record available.
Inventors
- 👤 Breen Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:33
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/82; H04M3/00; H04M3/42; H04M3/50; H04M3/53; H04M3/537
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2278504A
Cited
US2428007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |