Patent US5312254A successfully refreshed from Google Patents.
US3484560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Equipment for serving customer-dialed calls including those requiring operator assistance
Assignee: AT&T Inc
•
Filing: 1966-01-10
•
Granted: 1969-12-16
•
Expires: 1986-01-10
Abstract
No abstract record available.
Inventors
- 👤 Richard J Jaeger Jr
- 👤 Amos E Joel Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:59
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54; H04Q3/545
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3133153A
Cited
US3218392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |