Patent US4559639A successfully refreshed from Google Patents.
Patent US2646751A successfully refreshed from Google Patents.
US2646751A
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Control unit for steam generators
Assignee: NATHAN Manufacturing CORP
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Filing: 1950-05-20
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Granted: 1953-07-28
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Expires: 1970-05-20
Abstract
No abstract record available.
Inventors
- 👤 Carl F Erikson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:49
CPC Classifications
F; F22; F22D; F22D11/00; F04; F04B; F04B1/00; F04B1/02; F04B13/00; F04B13/02; F04B49/00; F04B49/12; F04B9/00; F04B9/02; F22D11/02; F04B1/04; F04B1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1613491A
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US1908534A
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US1860768A
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US1909955A
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US1964028A
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US2070935A
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US2235631A
Cited
US2268000A
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US2331046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |