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US2589566A
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US
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Electric water-heating system
Assignee: M F KELLER
•
Filing: 1949-12-15
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Granted: 1952-03-18
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Expires: 1969-12-15
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Neth
- 👤 John F Templeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:37
CPC Classifications
F; F24; F24D; F24D3/00; F24H; F24H3/00; F24H3/002; F24H3/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1715512A
Cited
US1828302A
Cited
US2066127A
Cited
US2048104A
Cited
US1965218A
Cited
US2375870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |