US4506022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide Gates
Assignee: Indresco Inc
•
Filing: 1983-09-16
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Granted: 1985-03-19
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Expires: 2003-09-16
Abstract
Abstract High alumina slide gate compositions comprising aluminous grain, carbonaceous material, high purity alumina, silicon metal and resin.
Inventors
- 👤 Dwight S. Whittemore
- 👤 David J. Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:39
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/14; B22D41/22; B22D41/28; B22D41/30; B22D41/32; C; C04; C04B; C04B35/00; C04B35/01; C04B35/013; C04B35/10; C04B35/101
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
52 words
High alumina slide gate composition comprising about 20 to 40%, by weight, of aluminous grain, about 2 to 10%, by weight, of carbonaceous material, about 40 to 60%, by weight, of high purity alumina, about 1 to 5% of silicon metal and about 3 to 5%, by weight, of liquid thermosetting resin.
Claim 2
Dependent Claim
52 words
High alumina slide gate composition comprising about 20 to 40%, by weight, of aluminous grain, about 2 to 10%, by weight, of carbonaceous material, about 40 to 60%, by weight, of high purity alumina, about 1 to 5% of silicon metal and about 3 to 5%, by weight, of liquid thermosetting resin.
Claim 3
Dependent Claim
15 words
Composition of claim 1, in which the aluminous grain contains at least about 50% mullite.
Claim 4
Dependent Claim
15 words
Composition of claim 1, in which there is present about 2 to 8% carbonaceous material.
Claim 5
Dependent Claim
11 words
Composition of claim 1, in which the carbonaceous material is graphite.
Claim 6
Dependent Claim
14 words
Composition of claim 1, in which there is about 2 to 4% silicon metal.
References Cited (Backward Citations)
US4063668A
Cited
US4108675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |