Patent US2670902A successfully refreshed from Google Patents.
US2670902A
Expired / Lapsed
US
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Fluid heater control apparatus
Assignee: Individual
•
Filing: 1951-01-15
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Granted: 1954-03-02
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Expires: 1971-01-15
Abstract
No abstract record available.
Inventors
- 👤 Russell F Dotson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:13
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE20584E
Cited
USRE22068E
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US1000435A
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US1678658A
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US1699143A
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US2261092A
Cited
US2305848A
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US2407170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |