Patent US2750997A successfully refreshed from Google Patents.
US2750997A
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US
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Dual fuel apparatus for heaters
Assignee: Surface Combustion Corp
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Filing: 1952-10-17
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Granted: 1956-06-19
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Expires: 1972-10-17
Abstract
No abstract record available.
Inventors
- 👤 Malvern M Reuter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:07
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/46; F23D14/62; F23D14/64; F23D99/00; F23D99/002; F23D99/004; F23D2206/00; F23D2206/0094; F23D2900/00; F23D2900/14; F23D2900/14641
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) | 1959-06-19 | 1959-12-19 | 1960-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-19 | 1963-12-19 | 1964-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-19 | 1967-12-19 | 1968-06-19 | $7700.00 | Window Closed / Lapsed |