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Patent US3372678A successfully refreshed from Google Patents.
US3372678A
Expired / Lapsed
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Steam generator with heat exchange on the tornado-flow principle
Assignee: Siemens AG
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Filing: 1966-08-05
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Granted: 1968-03-12
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Expires: 1986-08-05
Abstract
No abstract record available.
Inventors
- 👤 Schmidt Karl Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:22
CPC Classifications
F; F23; F23C; F23C3/00; F23C3/006; F23C3/008; F22; F22B; F22B1/00; F22B1/22
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) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |