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Patent US2698739A successfully refreshed from Google Patents.
US2698739A
Expired / Lapsed
US
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Heater assembly with expansion tank
Assignee: Rockwell Spring and Axle Co
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Filing: 1950-05-08
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Granted: 1955-01-04
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Expires: 1970-05-08
Abstract
No abstract record available.
Inventors
- 👤 Edmond H Haugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:38
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/08; F24D3/082; F24D3/085; F24D3/10
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) | 1958-01-03 | 1958-07-05 | 1959-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-03 | 1962-07-05 | 1963-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-03 | 1966-07-05 | 1967-01-04 | $7700.00 | Window Closed / Lapsed |