US3397878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Under-bath tuyere
Assignee: Union Carbide Corp
•
Filing: 1965-11-19
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Granted: 1968-08-20
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Expires: 1985-11-19
Abstract
No abstract record available.
Inventors
- 👤 Ronald L W Holmes
- 👤 Maurice F Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:11
CPC Classifications
B; B22; B22D; B22D1/00; B22D1/002; B22D1/005; C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/48; C21C7/00; C21C7/0037; C21C5/4606; C21C5/4613
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) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |