US2868944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric fluid heater
Assignee: Foster Wheeler Inc
•
Filing: 1957-06-12
•
Granted: 1959-01-13
•
Expires: 1977-06-12
Abstract
No abstract record available.
Inventors
- 👤 Eugene C Koch
- 👤 Kelvin J Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:07
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/10; F24H1/101; F24H1/102; F24H3/00; F24H3/02; F24H3/04; F24H3/0405; F24H9/00; F24H9/18; F24H9/1854; F24H9/1863
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) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |