US3206183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory coated tube and method of making same
Assignee: Individual
•
Filing: 1963-03-29
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Granted: 1965-09-14
•
Expires: 1983-03-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Howard L Marwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:32
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606; C21C5/4613
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
53 words
AN OXYGEN LANCE FOR USE IN STEEL PRODUCTION COMPRISING A METALLIC TUBULAR MEMBER, A PROTECTING REFRACTORY DISPOSED ABOUT SAID MEMBER AND COMPRISED OF A PLURALITY OF CONVOLUTELY WOUND LAYERS OF A CEMENT MATERIAL THAT IS A REFRACTORY AT THE TEMPERATURE OF MOLTEN STEEL, SAID LAYERS BEING SEPARATED BY A SHEET OF BURNABLE MATERIAL.
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) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |