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US3537957A
Expired / Lapsed
US
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Apparatus for the ignition of charging gases produced during the charging of coke ovens
Assignee: Raymond Kaiser Engineers Inc
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Filing: 1968-09-04
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Granted: 1970-11-03
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Expires: 1988-09-04
Abstract
No abstract record available.
Inventors
- 👤 Hans Wagner
- 👤 Folkmar Schwarz
- 👤 Heribert Wewers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:07
CPC Classifications
C; C10; C10B; C10B27/00; C10B27/04; F; F23; F23D; F23D14/00
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) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |