US3455543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical furnace
Assignee: Individual
•
Filing: 1967-01-20
•
Granted: 1969-07-15
•
Expires: 1987-01-20
Abstract
No abstract record available.
Inventors
- 👤 Wilhelm Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:21
CPC Classifications
F; F27; F27B; F27B3/00; F27B3/10; F27B3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1941410A
Cited
US2004916A
Cited
US2288491A
Cited
US2386565A
Cited
US3129930A
Cited
US3182985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-14 | 1973-01-13 | 1973-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-14 | 1977-01-13 | 1977-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-14 | 1981-01-13 | 1981-07-15 | $7700.00 | Window Closed / Lapsed |