US2622148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Government of Netherlands
•
Filing: 1949-03-15
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Granted: 1952-12-16
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Expires: 1969-03-15
Abstract
No abstract record available.
Inventors
- 👤 Hendrik Cornelis Anthon Duuren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:27
CPC Classifications
H; H03; H03M; H03M5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2235755A
Cited
US2183147A
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US2153737A
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US2279353A
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US2471126A
Cited
US2473202A
Cited
US2484226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |