US3899341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory fired shaped element and process of its manufacture
Assignee: Didier Werke AG
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Filing: 1974-04-04
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Granted: 1975-08-12
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Expires: 1994-04-04
Abstract
Abstract Novel refractory-fired, shaped elements for closures in pouring units for steel, iron and metal (nozzles, stoppers, spouts, slides) are provided. Said elements are based on zirconium oxide and zirconium silicate. The elements have advantageous thermal and mechanical properties and are economical to produce. A novel process for the production of these elements is also provided.
Inventors
- 👤 Hans Georg Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/481; B; B22; B22D; B22D41/00; B22D41/14; B22D41/16; B22D41/50; B22D41/52; B22D41/54; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3208; C04B2235/3231; C04B2235/3244; C04B2235/3246; C04B2235/3248; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5427; C04B2235/5436; C04B2235/60; C04B2235/602; C04B2235/6027; C04B2235/604; C04B2235/70; C04B2235/74; C04B2235/77
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
A REFRACTORY FIRED SHAPED ELEMENT FOR CLOSURES IN CASTING UNITS FOR METALS, SAID ELEMENT COMPRISING 10 TO 50% BY WEIGHT ZIRCONIUM OXIDE AND 50 TO 90% BY WEIGHT ZIRCONIUM SILICATE, 30 TO 60% BY WEIGHT OF THE TOTAL AMOUNT OF ZIRCONIUM OXIDE BEING PRESENT IN STABILIZED FROM 70 TO 40% BY WEIGHT OF THE TOTAL AMOUNT OF ZIRCONIUM OXIDE BEING PRESENT IN UNSTABILIZED FORM.
Claim 2
Dependent Claim
64 words
A REFRACTORY FIRED SHAPED ELEMENT FOR CLOSURES IN CASTING UNITS FOR METALS, SAID ELEMENT COMPRISING 10 TO 50% BY WEIGHT ZIRCONIUM OXIDE AND 50 TO 90% BY WEIGHT ZIRCONIUM SILICATE, 30 TO 60% BY WEIGHT OF THE TOTAL AMOUNT OF ZIRCONIUM OXIDE BEING PRESENT IN STABILIZED FROM 70 TO 40% BY WEIGHT OF THE TOTAL AMOUNT OF ZIRCONIUM OXIDE BEING PRESENT IN UNSTABILIZED FORM.
Claim 3
Dependent Claim
25 words
A refractory fired shaped element as in claim 1, characterized in that the zirconium oxide is employed in a grain size smaller than 0.1 mm.
Claim 4
Dependent Claim
25 words
A refractory fired shaped element as in claim 1, characterized in that the zirconium silicate is introduced in a grain size larger than 0.2 mm.
Claim 5
Dependent Claim
36 words
A refractory fired shaped element as claimed in claim 1 wherein the total stabilized and unstabilized zirconium oxide is present at about 35% by weight and the zirconium silicate is present at about 65% by weight.
Claim 6
Dependent Claim
22 words
A refractory fired shaped element as claimed in claim 1 wherein the zirconium oxide grain size is smaller than about 0.06 mm.
Claim 7
Dependent Claim
21 words
A refractory fired shaped element as claimed in claim 1 wherein the zirconium silicate grain size is about 0.2 -0.5 mm.
References Cited (Backward Citations)
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US2553265A
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US2624097A
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US3175919A
Cited
US3228778A
Cited
US3620781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |