US3517231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbogenerator having rotating superconducting excitation winding
Assignee: Siemens AG
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Filing: 1969-06-11
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Granted: 1970-06-23
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Expires: 1989-06-11
Abstract
No abstract record available.
Inventors
- 👤 Ernst Massar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:48
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/02; H02K19/00; H02K19/16; H02K19/26; H02K3/04; H02K3/22; H02K55/00; H02K55/02; H02K55/04; Y; Y02; Y02E; Y02E40/00; Y02E40/60
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 |