US3478724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel shaped heating surface for combustion chambers
Assignee: Sulzer AG
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Filing: 1967-12-26
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Granted: 1969-11-18
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Expires: 1987-12-26
Abstract
No abstract record available.
Inventors
- 👤 Alfred Brunner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:36
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/14; F22B37/143; F22G; F22G7/00; F22G7/14
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) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |