US3533709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating a pump-turbine in spinning reserve
Assignee: Baldwin Lima Hamilton Corp
•
Filing: 1968-12-05
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Granted: 1970-10-13
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Expires: 1988-12-05
Abstract
No abstract record available.
Inventors
- 👤 Richard B Willi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:23
CPC Classifications
F; F03; F03B; F03B3/00; F03B3/16; F03B3/18; F03B3/183; F03B15/00; F03B15/005; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/54; F04D29/56; F04D29/566; Y; Y02; Y02E; Y02E10/00; Y02E10/20; Y10; Y10S; Y10S415/00; Y10S415/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1919376A
Cited
US3007628A
Cited
GB1020383A
Cited
US3236497A
Cited
US3264485A
Cited
US3275293A
Cited
US3309057A
Cited
US3372645A
Cited
US3403888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |