US2698879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Class of service determining circuit
Assignee: AT&T Inc
•
Filing: 1949-11-30
•
Granted: 1955-01-04
•
Expires: 1969-11-30
Abstract
No abstract record available.
Inventors
- 👤 Shepherd Judson O'd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:46
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2224696A
Cited
US2402700A
Cited
US2299212A
Cited
US2352492A
Cited
US2355903A
Cited
US2370712A
Cited
US2408433A
Cited
US2388488A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-03 | 1958-07-05 | 1959-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-03 | 1962-07-05 | 1963-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-03 | 1966-07-05 | 1967-01-04 | $7700.00 | Window Closed / Lapsed |