Patent US2821239A successfully refreshed from Google Patents.
US2821239A
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US
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Assignee: Individual
•
Filing: 1953-12-18
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Granted: 1958-01-28
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Expires: 1973-12-18
Abstract
No abstract record available.
Inventors
- 👤 Brendel Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:09
CPC Classifications
B; B60; B60N; B60N2/00; B60N2/24; B60N2/38; B60N2/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US90985A
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US458136A
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US1037477A
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US1135923A
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US1435585A
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US1887287A
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USRE19327E
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US2544106A
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US2567346A
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US2680472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |