US2994288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion and contraction control of refractory furnace roofs
Assignee: Harbison Walker Refractories Co
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Filing: 1959-05-06
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Granted: 1961-08-01
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Expires: 1979-05-06
Abstract
No abstract record available.
Inventors
- 👤 John D Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:14
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/02; F27D1/025; F27D1/027; F27D21/00; F27D1/0003; F27D1/0023; F27D2021/005
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) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |