Patent US2799739A successfully refreshed from Google Patents.
US2799739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for identifying conductor pairs
Assignee: AT&T Inc
•
Filing: 1956-04-17
•
Granted: 1957-07-16
•
Expires: 1976-04-17
Abstract
No abstract record available.
Inventors
- 👤 Henry C J Lowman
- 👤 Edward M Murphy
- 👤 John C Musgrave
- 👤 Melvin L Somers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:23
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/229; G; G01; G01R; G01R31/00; G01R31/50; G01R31/58; G01R31/60
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |