US2894073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Line concentrator checking arrangement
Assignee: AT&T Inc
•
Filing: 1957-12-31
•
Granted: 1959-07-07
•
Expires: 1977-12-31
Abstract
No abstract record available.
Inventors
- 👤 Frank E Blount
- 👤 Myron E Krom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:04
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004; H04Q1/00; H04Q1/18; H04Q1/20; H04Q1/22; H04Q1/26
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) | 1962-07-06 | 1963-01-05 | 1963-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-06 | 1967-01-05 | 1967-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-06 | 1971-01-05 | 1971-07-07 | $7700.00 | Window Closed / Lapsed |