Patent US3035211A successfully refreshed from Google Patents.
US3035211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subscriber calling apparatus
Assignee: AT&T Inc
•
Filing: 1958-10-21
•
Granted: 1962-05-15
•
Expires: 1978-10-21
Abstract
No abstract record available.
Inventors
- 👤 Clifford E Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:23
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/23
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US353184A
Cited
US2733320A
Cited
US1820264A
Cited
US1568508A
Cited
US2287797A
Cited
US2438496A
Cited
US2652470A
Cited
US2854552A
Cited
US2903633A
Cited
US2916566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |