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US3469827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace
Assignee: British Iron and Steel Research Association BISRA
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Filing: 1967-12-01
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Granted: 1969-09-30
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Expires: 1987-12-01
Abstract
No abstract record available.
Inventors
- 👤 William Robert Laws
- 👤 Henry Christopher Holt
- 👤 Frank Michael Salter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:55
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/14; F27B9/20; F27B9/22; F27B9/30; F27B9/3005; F27B9/36; F27B2009/3653; F27B2009/3661; F27D; F27D9/00; F27D2009/0002; F27D2009/0005
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) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |