Patent US1149254A successfully refreshed from Google Patents.
US5069702A
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Method of making small hollow glass spheres
Assignee: WR Grace and Co Conn
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Filing: 1990-12-20
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Granted: 1991-12-03
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Expires: 2010-12-20
Abstract
Abstract Small hollow glass spheres are prepared by adding a surfactant to a liquid glass precursor mixture. The surfactant-containing solution or dispersion can be formed into droplets which are directed into a heated zone and the product collected in a cooler zone. Alternately, the solution or dispersion may be spray-dried, and the spray-dried product is fed into the heated zone and collected in the cooler zone. Nonionic fluorocarbon surfactants are the preferred surfactants.
Inventors
- 👤 Jacob Block
- 👤 Noel J. Tessier
- 👤 Anthony J. Colageo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:14
CPC Classifications
C; C03; C03C; C03C11/00; C03C11/002; C03B; C03B19/00; C03B19/10; C03B19/1005; C03B19/106; C03B19/1065
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
77 words
A process for the preparation of hollow glass spheres comprising the steps of: a) combining i) a surfactant, ii) at least one source of components necessary to form said glass, iii) a compound capable of producing a gas when heated, and iv) water, to form an aqueous solution or dispersion; b) forming droplets from the surfactant-containing solution or dispersion; c) heating the droplets to form hollow glass spheres; and d) cooling and recovering the hollow glass spheres.
Claim 2
Dependent Claim
77 words
A process for the preparation of hollow glass spheres comprising the steps of: a) combining i) a surfactant, ii) at least one source of components necessary to form said glass, iii) a compound capable of producing a gas when heated, and iv) water, to form an aqueous solution or dispersion; b) forming droplets from the surfactant-containing solution or dispersion; c) heating the droplets to form hollow glass spheres; and d) cooling and recovering the hollow glass spheres.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein the droplets are formed by spraying the solution or dispersion.
Claim 4
Dependent Claim
18 words
A process according to claim 2 where the surfactant-containing solution or dispersion is spray-dried prior to said heating.
Claim 5
Dependent Claim
13 words
A process according to claim 1 where the surfactant is a nonionic surfactant.
Claim 6
Dependent Claim
12 words
A process according to claim 4, where the surfactant is fluorocarbon surfactant.
Claim 7
Dependent Claim
24 words
A process according to claim 1 where the surfactant concentration is about 0.05 to 5 wt. % based on the total solution or dispersion.
Claim 8
Dependent Claim
24 words
A process according to claim 6 where the surfactant concentration is about 0.1 to 3 wt. % based on the total solution or dispersion.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein said components necessary to form said glass include a source of silica, one or more metallic cations, and a boron-containing compound.
Claim 10
Dependent Claim
28 words
A process according to claim 8 where the source of silica is selected from the group consisting of sodium silicate, colloidal silica powder, silica sol, and mixtures thereof.
Claim 11
Dependent Claim
25 words
A process according to claim 8 where the metallic cations are selected from the group consisting of alkali metals or alkaline earths metals, and aluminum.
Claim 12
Dependent Claim
25 words
A process according to claim 8 where the boron compound is selected from the group consisting of boric acid, boric acid salt, and mixtures thereof.
Claim 13
Dependent Claim
25 words
A process according to claim 9 where the silica concentration is about 40-90 wt. % based on the total solids in the solution or dispersion.
Claim 14
Dependent Claim
13 words
A process according to claim 1 where the gas producing compound is urea.
Claim 15
Dependent Claim
27 words
A process according to claim 13 where the urea concentration is about 0.2 to 20 wt. % based on the total solids in the solution or dispersion.
Claim 16
Dependent Claim
27 words
A process according to claim 14 where the urea concentration is about 0.4 to 12 wt. % based on the total solids in the solution or dispersion.
Claim 17
Dependent Claim
19 words
A process according to claim 1 where said heating is at a temperature of about 800° to 1700° C.
Claim 18
Dependent Claim
15 words
A process according to claim 16 where said temperature is about 1000° to 1500° C.
Claim 19
Dependent Claim
16 words
A process according to claim 17 where the heating occurs for about 0.1 to 5 seconds.
Claim 20
Dependent Claim
16 words
A process according to claim 18 where the heating occurs for about 0.5 to 2 seconds.
Claim 21
Dependent Claim
20 words
A process according to claim 2 where the solution or dispersion is sprayed through a nozzle to form said droplets.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |