Patent US4464030A successfully refreshed from Google Patents.
US2552008A
Expired / Lapsed
US
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Jet-powered rotor system for helicopters
Assignee: Individual
•
Filing: 1948-03-19
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Granted: 1951-05-08
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Expires: 1968-03-19
Abstract
No abstract record available.
Inventors
- 👤 Isidor B Laskowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:31
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR705003A
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FR795517A
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FR883462A
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US2346007A
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US2334967A
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US2408489A
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US2371687A
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GB556866A
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US2438151A
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US2435080A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |