US3836613A
Expired / Lapsed
US
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Method of making liner in an induction melting furnace
Assignee: VFG VERTRIEBSGES fur GIESSTEC
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Filing: 1971-11-02
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Granted: 1974-09-17
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Expires: 1991-11-02
Abstract
Abstract A METHOD OF PREPARING A SELF SUPPORTING LINER FOR AN INDUCTION MELTING FURANCE IS DISCLOSED. A DRY REFRACTORY TERTIARY QUARTZITE GRANULAR COMPOSITION IS FILLED BETWEEN THE FURNACE WALL AND A FORM DEFINING THE INNER SHAPE OF THE LINER AND DENSIFIED AS BY VIBRATION APPLIED TI THE FORM. THE FORM IS REMOVED TO LEAVE A SELFSUPPORTING LINER. THE EXPOSED INNER SURFACE OF THE LINER IS IMPREGNATED WITH A BINDER TO A DEPTH LESS THAN THE TOTAL THICKNESS OF THE LINER TO FORM AN INNER STRENGTHENED SHELL HAVING A THICKNESS OF FROM 1-8 MM. THE INNER SHELL IS THEN SINTERED LEAVING THE OUTER ZONE OF SAID LINEAR UNSINTERED.
Inventors
- 👤 K Granitzki
- 👤 P Schiefer
- 👤 H Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:23
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/16; F27D1/1626; C; C04; C04B; C04B35/00; C04B35/01; C04B35/14; F27B; F27B14/00; F27B14/06; F27B14/061
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |