Patent US3063674A successfully refreshed from Google Patents.
US3063674A
Expired / Lapsed
US
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Rotor construction and method
Assignee: Individual
•
Filing: 1961-02-08
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Granted: 1962-11-13
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Expires: 1981-02-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Clarence E Middlebrooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:24
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3053; F01D5/12; F01D5/14; F01D5/18; F01D5/187; F01D5/3023
Claims Analysis
Total Claims: 0
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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) | 1965-11-12 | 1966-05-14 | 1966-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-12 | 1970-05-14 | 1970-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-12 | 1974-05-14 | 1974-11-13 | $7700.00 | Window Closed / Lapsed |