Patent US2535569A successfully refreshed from Google Patents.
US2535569A
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US
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Control means for electric steam generators
Assignee: Combustion Engineering Inc
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Filing: 1947-12-23
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Granted: 1950-12-26
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Expires: 1967-12-23
Abstract
No abstract record available.
Inventors
- 👤 Toensfeldt Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:51
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/28; F22B1/30; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2937; Y10T137/294; Y10T137/6416; Y10T137/6606; Y10T137/7287; Y10T137/7303; Y10T137/7306; Y10T137/7358; Y10T137/7368; Y10T137/7371; Y10T137/7378; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7781; Y10T137/7784; Y10T137/7787
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) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |