US3785932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing device for coke oven door
Assignee: Raymond Kaiser Engineers Inc
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Filing: 1972-02-01
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Granted: 1974-01-15
•
Expires: 1992-02-01
Abstract
Abstract The perimeter of the door frame of a coke oven door is fitted with a sealing knife edge and a plurality of pivotal interacting levers mounted to the door frame. The levers exert uniform forces on the knife edge and the door jam.
Inventors
- 👤 L Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:24
CPC Classifications
C; C10; C10B; C10B25/00; C10B25/02; C10B25/16
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |