Patent US2962599A successfully refreshed from Google Patents.
US2962599A
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US
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Apparatus for developing and accumulating hydroelectric energy
Assignee: Individual
•
Filing: 1957-09-09
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Granted: 1960-11-29
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Expires: 1977-09-09
Abstract
No abstract record available.
Inventors
- 👤 Frank Z Pirkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:45
CPC Classifications
E; E02; E02B; E02B9/00; F; F03; F03B; F03B13/00; F03B13/06; Y; Y02; Y02E; Y02E10/00; Y02E10/20; Y02E60/00; Y02E60/16; Y10; Y10S; Y10S415/00; Y10S415/91
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) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |