US2741663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic switching system
Assignee: Government of Netherlands
•
Filing: 1951-06-07
•
Granted: 1956-04-10
•
Expires: 1971-06-07
Abstract
No abstract record available.
Inventors
- 👤 Oberman Roelof Maarten Marie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:47
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1559736A
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US2129011A
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US2252856A
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US2326458A
Cited
US2363671A
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US2529166A
Cited
US2629019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |