US2986758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning of sealing surfaces for doors on the door frames of horizontal coke ovens
Assignee: Woodall Duckham Construction Co Ltd
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Filing: 1958-12-16
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Granted: 1961-06-06
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Expires: 1978-12-16
Abstract
No abstract record available.
Inventors
- 👤 Randell Geoffrey Edwar Charles
- 👤 Whitworth Herbert Milton
- 👤 Holme Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:18
CPC Classifications
C; C10; C10B; C10B43/00; C10B43/02; C10B43/04; F; F23; F23M; F23M7/00
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) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |