US3035122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant current line circuitt for loop telephone lines
Assignee: General Dynamics Corp
•
Filing: 1958-09-30
•
Granted: 1962-05-15
•
Expires: 1978-09-30
Abstract
No abstract record available.
Inventors
- 👤 James K Livingstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:54
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; H; H04; H04M; H04M19/00; H04M19/001
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2693568A
Cited
US2897430A
Cited
US2751549A
Cited
US2897431A
Cited
US2841757A
Cited
US2832035A
Cited
US2897432A
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 |