US4471019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-containing water glass fibers
Assignee: Ema Corp
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Filing: 1983-07-27
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Granted: 1984-09-11
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Expires: 2003-07-27
Abstract
Abstract Water-containing water glass fibers are disclosed, substantially free from non-alkaline compounds and having a water content of from about 15 to 30% by weight, a tear strength of from about 5 to 30 cN/tex, a ratio of alkaline oxide to silicon dioxide of from about 1:3 to 1:1.9, an amorphous structure and a density of from about 2 g/cm3 to 2.5 g/cm3. The fibers are preferably cut into lengths of from 1 to 40 mm. They may be used for subsequent production of silica fibers, a technique more advantageous than producing the latter from a melt containing SiO2 or by acid-leaching of glass fibers. The silica fibers are useful for producing wet webs, filter linings and reinforcing material.
Inventors
- 👤 Arno Wegerhoff
- 👤 Hans Zengel
- 👤 Walter Brodowski
- 👤 Heinz Beck
- 👤 Ernst Seeberger
- 👤 Gerhard Steenken
- 👤 Karlheinz Hillermeider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:36
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/03; B; B01; B01D; B01D39/00; B01D39/02; B01D39/06; B01D39/14; B01D39/20; B01D39/2003; B01D39/2017; C03B37/011; C03C; C03C13/00; C03C13/005; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/6224; D; D01; D01F; D01F9/00; D01F9/08; F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; F16D2200/00; F16D2200/006; F16D2200/0065; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/298; Y10T442/00; Y10T442/60; Y10T442/696
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
Water-containing water glass fibers, substantially free from non-alkaline compounds and having a water content of from about 15 to 30% by weight, a tear strength of from about 5 to 30 cN/tex, a ratio of alkaline oxide to silicon dioxide of from about 1:3 to 1:1.9, an amorphous structure and a density of from about 2 g/cm 3 to 2.5 g/cm 3 .
Claim 2
Dependent Claim
63 words
Water-containing water glass fibers, substantially free from non-alkaline compounds and having a water content of from about 15 to 30% by weight, a tear strength of from about 5 to 30 cN/tex, a ratio of alkaline oxide to silicon dioxide of from about 1:3 to 1:1.9, an amorphous structure and a density of from about 2 g/cm 3 to 2.5 g/cm 3 .
Claim 3
Dependent Claim
16 words
The water glass fibers of claim 1, in lengths of from about 1 to 40 mm.
Claim 4
Dependent Claim
24 words
Filter linings prepared from silica fibers obtained by treating the water glass fibers of claim 1 with acid and/or salt solutions containing hydrogen ions.
Claim 5
Dependent Claim
24 words
Wet webs prepared from silica fibers obtained by treating the water glass fibers of claim 1 with acid and/or salt solutions containing hydrogen ions.
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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) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |