US4200445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of densifying metal oxides
Assignee: Corning Glass Works
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Filing: 1978-04-10
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Granted: 1980-04-29
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Expires: 1998-04-10
Abstract
Abstract A method of densifying a fumed metal oxide is disclosed wherein the metal oxide is converted to a flowable sol and then dried to form a fragmented solid which is calcined. The calcined oxide may be wet milled to provide a slip for casting articles such as fused silica crucibles used in melting silicon. The method also permits the production of very refractory fused glass compositions from fumed metal oxides at temperatures substantially below those required where a melting step is employed.
Inventors
- 👤 Peter P. Bihuniak
- 👤 Lewis H. Brandes
- 👤 Donald L. Guile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:16
CPC Classifications
C; C03; C03C; C03C12/00; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C03B; C03B19/00; C03B19/10; C03B19/1005; C03B19/106; C03B19/1065; C03C3/00; C03C3/04; C03C3/076; C04; C04B; C04B35/00; C04B35/01; C04B35/14; C30; C30B; C30B13/00; C30B13/14; C30B15/00; C30B15/10; Y; Y10; Y10S; Y10S65/00; Y10S65/901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
A method for producing glassy granules of high silica glass (>70% by weight SiO 2 ) containing at least one metal oxide from Groups III and IV of the Periodic Table selected from the group of Al 2 O 3 , B 2 O 3 , GeO 2 , HfO 2 , ZrO 2 , and TiO 2 which consists of the steps: (a) a silica-producing component and said Group III and/or Group IV metal oxide-producing component are passed through a flame burner to form a composite fumed product of uniform composition; (b) said composite fumed product is mixed with a polar liquid to form a flowable sol containing up to 45% solids content; (c) said polar liquid is removed from said sol to produce a fragmented solid; and then (d) said fragmented solid is calcined within the temperature range of 1150°-1500° C. to produce glassy granules.
Claim 2
Independent Claim
147 words
A method for producing glassy granules of high silica glass (>70% by weight SiO 2 ) containing at least one metal oxide from Groups III and IV of the Periodic Table selected from the group of Al 2 O 3 , B 2 O 3 , GeO 2 , HfO 2 , ZrO 2 , and TiO 2 which consists of the steps: (a) a silica-producing component and said Group III and/or Group IV metal oxide-producing component are passed through a flame burner to form a composite fumed product of uniform composition; (b) said composite fumed product is mixed with a polar liquid to form a flowable sol containing up to 45% solids content; (c) said polar liquid is removed from said sol to produce a fragmented solid; and then (d) said fragmented solid is calcined within the temperature range of 1150°-1500° C. to produce glassy granules.
Claim 3
Dependent Claim
18 words
A method according to claim 1 wherein said fragmented solid has a cross section of not over 0.25".
Claim 4
Dependent Claim
12 words
A method according to claim 1 wherein said polar liquid is water.
References Cited (Backward Citations)
US2268589A
Cited
US3244639A
Cited
US3759683A
Cited
US3847583A
Cited
US3678144A
Cited
US3867156A
Cited
US3868227A
Cited
US3799754A
Cited
US3941574A
Cited
US4042361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |