US2704660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid fuel fired open hearth furnaces
Assignee: MAERZ IND OFENBAU AG
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Filing: 1951-02-07
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Granted: 1955-03-22
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Expires: 1971-02-07
Abstract
No abstract record available.
Inventors
- 👤 Bartu Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:51
CPC Classifications
F; F27; F27B; F27B3/00; F27B3/002; F27B3/005; F27B3/10; F27B3/20; F27B3/205
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) | 1958-03-21 | 1958-09-20 | 1959-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-21 | 1962-09-20 | 1963-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-21 | 1966-09-20 | 1967-03-22 | $7700.00 | Window Closed / Lapsed |