US4141769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermit compositions
Assignee: Foseco Trading AG
•
Filing: 1977-03-04
•
Granted: 1979-02-27
•
Expires: 1997-03-04
Abstract
Abstract A thermit composition useful for repairing ingot mould base plates is described. It comprises a particulate oxidizable metal, particulate iron oxide and a particulate refractory filler consisting wholly or partly of zircon, the refractory filler material being present in a proportion of 18 to 35 parts by weight per 100 parts by weight of easily oxidizable metal and iron oxide.
Inventors
- 👤 Takayuki Akiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:23
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/06; B22D7/062; F; F24; F24V; F24V30/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
51 words
In a thermit composition comprising a particulate oxidisable metal, particulate iron oxide and a particulate refractory filler, the improvement that the particulate refractory filler comprises zircon and is present in an amount of 18 to 35 parts by weight per 100 parts by weight of easily oxidisable metal and iron oxide.
Claim 2
Dependent Claim
51 words
In a thermit composition comprising a particulate oxidisable metal, particulate iron oxide and a particulate refractory filler, the improvement that the particulate refractory filler comprises zircon and is present in an amount of 18 to 35 parts by weight per 100 parts by weight of easily oxidisable metal and iron oxide.
Claim 3
Dependent Claim
20 words
The thermit composition of claim 1 wherein the particulate refractory filler is all of particle size less than 2.0 mm.
Claim 4
Dependent Claim
19 words
The thermit composition of claim 1 wherein more than 50% by weight of the refractory filler consists of zircon.
Claim 5
Dependent Claim
59 words
The thermit composition of claim 1 wherein the particulate refractory filler includes in addition to particulate zircon, at least one further refractory filler selected from the class consisting of silica sand, silica flour, olivine, quartz, chamotte, mullite, crushed refractory fire brick, sillimanite, fire clay, silicon carbide, magnesite, aluminium silicate, dead burnt dolomite, aluminia, magnesia, fused silica and vitreous silica.
References Cited (Backward Citations)
US3695951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |