US3480375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burner for metallurgical furnaces
Assignee: Koppers Wistra Ofenbau GmbH
•
Filing: 1968-04-18
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Granted: 1969-11-25
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Expires: 1988-04-18
Abstract
No abstract record available.
Inventors
- 👤 Richard Sitte
- 👤 Gunter Willems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:52
CPC Classifications
F; F23; F23C; F23C3/00; F23D; F23D14/00; F23D14/20; F23D14/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2876831A
Cited
GB825124A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |