US2979569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telecommunication system
Assignee: Government of Netherlands
•
Filing: 1953-06-08
•
Granted: 1961-04-11
•
Expires: 1973-06-08
Abstract
No abstract record available.
Inventors
- 👤 Kosten Leendert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:53
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2513112A
Cited
US2668875A
Cited
US2594495A
Cited
US2596741A
Cited
US2667538A
Cited
US2749037A
Cited
US2764634A
Cited
US2700148A
Cited
US2738382A
Cited
US2865563A
Cited
US2782256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |