Patent US3709794A successfully refreshed from Google Patents.
US3709794A
Expired / Lapsed
US
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Coke oven machinery door extractor shroud
Assignee: Raymond Kaiser Engineers Inc
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Filing: 1971-06-24
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Granted: 1973-01-09
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Expires: 1991-06-24
Abstract
Abstract A shroud that is movable into position with a door extractor forms a seal with the buckstays of a coke oven and provides a curtain of negative pressure around the perimeter of the door. A spillage box is extended to a position beneath the doorsill to catch the fallout of coke when the door is retracted.
Inventors
- 👤 R Kinzler
- 👤 W Edgar
- 👤 J Sustarsic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:32
CPC Classifications
C; C10; C10B; C10B33/00; C10B33/003; C10B25/00; C10B25/02; C10B25/08; C10B25/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |