US4684387A
Expired / Lapsed
US
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Method for manufacturing glass bodies
Assignee: US Philips Corp
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Filing: 1986-02-24
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Granted: 1987-08-04
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Expires: 2006-02-24
Abstract
Abstract A method of and arrangements for manufacturing glass bodies, in which the starting material for the glass body, being a suspension having a microdispersed solids content, is used to form a porous green body which is subsequently purified and sintered, in which, by separating the phases of the suspension in an arrangement in which a pressure difference can be built up, the green body is deposited on a porous membrane whose shape corresponds to that of the glass body to be produced, the pores of the membrane having a diameter in the range from 1 to 500 times the average particle diameter of the solids content of the suspension.
Inventors
- 👤 Rolf Clasen
- 👤 Wilhelm G. Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:40
CPC Classifications
C; C03; C03B; C03B19/00; C03B19/12; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/016; Y; Y10; Y10S; Y10S65/00; Y10S65/15; Y10S65/16; Y10S65/90; Y10S65/901
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
111 words
In a method of manufacturing glass bodies, in which the starting material for the glass body, is a suspension having a microdispersed solids content which is used to form a porous green body which is subsequently purified and sintered, the improvement wherein the phases of the suspension are separated in an arrangement in which a pressure difference is built up, in said arrangement the green body being deposited on a porous membrane whose shape corresponds to that of the glass body to be produced, the pores of the membrane having a diameter in the range from 1 to 500 times the average particle diameter of the solids content of the suspension.
Claim 2
Dependent Claim
111 words
In a method of manufacturing glass bodies, in which the starting material for the glass body, is a suspension having a microdispersed solids content which is used to form a porous green body which is subsequently purified and sintered, the improvement wherein the phases of the suspension are separated in an arrangement in which a pressure difference is built up, in said arrangement the green body being deposited on a porous membrane whose shape corresponds to that of the glass body to be produced, the pores of the membrane having a diameter in the range from 1 to 500 times the average particle diameter of the solids content of the suspension.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1, wherein an underpressure is produced in the arrangement.
Claim 4
Dependent Claim
17 words
A method as claimed in claim 1, characterized in that an overpressure is produced in the arrangement.
Claim 5
Dependent Claim
45 words
A method as claimed in claim 1, wherein an aqueous suspension is used as the starting material for the glass body, which suspension comprises SiO 2 particles having a diameter in the range from 10 to 500 nm, the average particle diameter being 40 nm.
Claim 6
Dependent Claim
22 words
A method as claimed in claim 1, wherein a suspension is used having a solid: water weight ratio of 1:1 to 1:2.
Claim 7
Dependent Claim
27 words
A method as claimed in claim 1, wherein an ionogenic additive is added to the suspension, thereby moving the pH value of the suspension towards alkalinity (pH≦10).
Claim 8
Dependent Claim
17 words
A method as claimed in claim 6, wherein an ammonia compound is used as the ionogenic additive.
Claim 9
Dependent Claim
30 words
A method as claimed in claim 6, wherein the ionogenic additive is added in an amount of from 0.1 to 5% by weight of the solids content of the suspension.
Claim 10
Dependent Claim
26 words
A method as claimed in claim 1, wherein a laminated body is formed on the membrane by depositing in succession various layers of differently doped suspensions.
Claim 11
Dependent Claim
29 words
A method as claimed in claim 9, wherein suspensions are used having dopants which cause the layer of the glass body to be produced to have different refractive indices.
Claim 12
Dependent Claim
29 words
A method as claimed in claim 1, wherein a porous green body made of the starting material for the glass body to be produced is used as a membrane.
Claim 13
Dependent Claim
42 words
A method as claimed in claim 1, wherein the green body is deposited on a membrane whose deposition area is coated with a a synthetic resin lining having a porosity ≦ the average particle diameter of the solids content of the suspension.
Claim 14
Dependent Claim
13 words
A method as claimed in claim 1, wherein a polyethylene membrane is used.
Claim 15
Dependent Claim
19 words
A method as claimed in claim 11 wherein a membrane is used whose pores have a diameter ≦20 μm.
Claim 16
Dependent Claim
26 words
A method as claimed in claim 1, wherein an underpressure up to 15 mbar or an overpressure up to 10 bar is produced in the arrangement.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |