US3429565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical degasser vessels
Assignee: Harbison Walker Refractories Co
•
Filing: 1966-12-23
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Granted: 1969-02-25
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Expires: 1986-12-23
Abstract
No abstract record available.
Inventors
- 👤 Nicholas Napora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:10
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10; F; F27; F27D; F27D1/00; F27D1/0003; F27D1/0006; F27D1/14; F27D1/141; F27D1/142
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) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |