US3053936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone line supervisory system
Assignee: International Standard Electric Corp
•
Filing: 1957-09-25
•
Granted: 1962-09-11
•
Expires: 1977-09-25
Abstract
No abstract record available.
Inventors
- 👤 Steinbuch Karl
- 👤 Braun Reinhold
- 👤 Merz Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:25
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/80; H03K17/82; H04; H04M; H04M15/00; H04M15/04; H04M3/00; H04M3/22; H04M3/36; H04Q; H04Q3/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2378541A
Cited
US2736880A
Cited
US2734182A
Cited
US2784390A
Cited
US2854517A
Cited
US2803812A
Cited
US2898591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |