Patent US4528244A successfully refreshed from Google Patents.
US4528244A
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Fused silica shapes
Assignee: Dresser Industries Inc
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Filing: 1983-09-30
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Granted: 1985-07-09
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Expires: 2003-09-30
Abstract
Abstract Fused silica shapes having a coating of sialon on the surfaces thereof.
Inventors
- 👤 Howard M. Winkelbauer
- 👤 Ke-Chin Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:00
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C03; C03C; C03C17/00; C03C17/22; C03C17/225; C04B41/45; C04B41/50; C04B41/5053; C04B41/5062; C04B41/5067; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C03C2217/00; C03C2217/20; C03C2217/29; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/17
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
11 words
Fused silica shapes having a coating of sialon on its surfaces.
Claim 2
Dependent Claim
11 words
Fused silica shapes having a coating of sialon on its surfaces.
Claim 3
Dependent Claim
20 words
Shapes of claim 1, in which there is about 2 to 10%, by weight, colloidal silica in the sialon coating.
Claim 4
Dependent Claim
13 words
Shapes of claim 1, in which the coating contains, in addition, a dispersant.
Claim 5
Dependent Claim
15 words
Shapes of claim 3, in which the dispersant is an aqueous solution of a polyelectrolyte.
Claim 6
Dependent Claim
20 words
Shapes of claim 1, in which the sialon content in the coating ranges between about 70 and 90%, by weight.
Claim 7
Dependent Claim
19 words
Shapes of claim 1, in which the colloidal silica comprises at least about 2%, by weight, of the coating.
References Cited (Backward Citations)
US4303181A
Cited
US4406670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |