US3447494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating a steam generator and improved burner system therefor
Assignee: Bergwerksverband GmbH
•
Filing: 1966-10-04
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Granted: 1969-06-03
•
Expires: 1986-10-04
Abstract
No abstract record available.
Inventors
- 👤 Ottmar Schwarz
- 👤 Heinrich Merten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:01
CPC Classifications
F; F23; F23D; F23D1/00; F23D1/005; F23D11/00; F23D11/04; F23D11/06; F23C; F23C2700/00; F23C2700/06; F23C2700/066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3124086A
Cited
US1726870A
Cited
US1892053A
Cited
US1878926A
Cited
US1953090A
Cited
US2197647A
Cited
US3229650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |