US3516245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed cycle-tangential flow turbine
Assignee: Individual
•
Filing: 1969-03-11
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Granted: 1970-06-23
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Expires: 1989-03-11
Abstract
No abstract record available.
Inventors
- 👤 Donald A Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:48
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/10; F01C11/00; F01C11/002; F01C11/004; F01C21/04; F02; F02B; F02B53/00; F02B53/04; F02B53/08; F02G; F02G2250/00; F02G2250/03; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |