US3373981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for operating a burner fired shaft furnace
Assignee: Didier Werke AG
•
Filing: 1965-05-26
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Granted: 1968-03-19
•
Expires: 1985-05-26
Abstract
No abstract record available.
Inventors
- 👤 Taubmann Harro
- 👤 Boderke Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:30
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/005; F27B1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US513945A
Cited
US1197985A
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US1841463A
Cited
US2282551A
Cited
US2670946A
Cited
FR1244302A
Cited
US3204936A
Cited
US3275062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |