Patent US2443452A successfully refreshed from Google Patents.
US2998489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone message service
Assignee: AT&T Inc
•
Filing: 1958-03-25
•
Granted: 1961-08-29
•
Expires: 1978-03-25
Abstract
No abstract record available.
Inventors
- 👤 Robert R Riesz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:32
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/50; H04M3/53; H04M3/533
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |