US2498081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic counting
Assignee: AT&T Inc
•
Filing: 1944-12-29
•
Granted: 1950-02-21
•
Expires: 1964-12-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Amos E Joel
- 👤 Robert O Soffel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:02
CPC Classifications
H; H03; H03K; H03K29/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1976400A
Cited
US2036350A
Cited
US2057773A
Cited
US2224677A
Cited
US2361766A
Cited
US2403615A
Cited
US2404106A
Cited
US2415567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |