Patent US3667174A successfully refreshed from Google Patents.
Patent US5294480A successfully refreshed from Google Patents.
US5294480A
Expired / Lapsed
US
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Moldings or sheets made from silica aerogels
Assignee: BASF SE
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Filing: 1993-01-14
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Granted: 1994-03-15
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Expires: 2013-01-14
Abstract
Abstract A molding based on supercritically dried silica aerogel parts in the form of spherical particles having a diameter of from 0.1 to 10 mm or sheet-like pieces having a thickness of from 2 to 30 mm and a diameter of from 1 to 5 cm, wherein the molding is produced by pressing at from 500° to 1000° C. and at from 0.5 to 10 bar, if necessary under a protective gas, such as nitrogen, without addition of binders.
Inventors
- 👤 Manfred Mielke
- 👤 Guenther Seybold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:55
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0091; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/157; C01B33/158; C01B33/1585; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/164; Y10T442/30
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
70 words
A molding based on supercritically dried silica aerogel parts in the form of spherical particles having a diameter of from 0.1 to 10 mm or sheet-like pieces having a thickness of from 2 to 30 mm and a diameter of from 1 to 5 cm, wherein the molding is produced by pressing at from 500° to 100° C. and at from 0.5 to 10 bar, without the additional of binders.
Claim 2
Dependent Claim
70 words
A molding based on supercritically dried silica aerogel parts in the form of spherical particles having a diameter of from 0.1 to 10 mm or sheet-like pieces having a thickness of from 2 to 30 mm and a diameter of from 1 to 5 cm, wherein the molding is produced by pressing at from 500° to 100° C. and at from 0.5 to 10 bar, without the additional of binders.
Claim 3
Dependent Claim
12 words
A molding as defined in claim 1 which is transparent to light.
Claim 4
Dependent Claim
21 words
A molding as defined in claim 1, which is pressed with quartz, mica or glass sheets to give a light-transparent element.
Claim 5
Dependent Claim
40 words
A molding as defined in claim 1, which is laminated with a transparent polymer layer based on polymethacrylate, polyurethane, polyacrylate, polycarbonate, polyvinyl chloride, polyvinyl fluoride, polyvinylidene chloride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymers, polyether sulfone, polyethylene glycol terephthalate or silicone rubbers.
Claim 6
Dependent Claim
23 words
A molding as defined in claim 1, which contains finely divided carbon black as opacifier in an amount of from 5 to 20%.
Claim 7
Dependent Claim
24 words
A molding as defined in claim 1, which contains finely divided titanium dioxide (rutile) as opacifier in an amount of from 10 to 50%.
Claim 8
Dependent Claim
25 words
A molding as defined in claim 1, which contains finely divided Fe 3 O 4 as opacifier in an amount of from 10 to 50%.
Claim 9
Dependent Claim
25 words
A molding as defined in claim 1, which contains finely divided mica (muscovite) as opacifier in an amount of from 20 to 40% by weight.
Claim 10
Dependent Claim
26 words
A molding as defined in claim 1, which contains finely divided ilmenite FeTiO 3 as opacifier in an amount of from 10 to 40% by weight.
Claim 11
Dependent Claim
20 words
A molding as defined in claim 1, which comprises aerogel beads having a diameter of from 2 to 6 millimeters.
Claim 12
Dependent Claim
25 words
A molding as defined in claim 1, which comprises aerogel beads having a diameter of less than 2 millimeters, preferably from 0.1 to 0.5 millimeters.
Claim 13
Dependent Claim
30 words
A molding as defined in claim 1, which comprises a mixture of coarse and fine aerogel beads, which are mixed in a volume ratio from 80:20 to 50:50 and pressed.
Claim 14
Dependent Claim
36 words
A molding as defined in claim 1, which is pressed with mesh-form quartz fiber or glass fiber woven fabric structures on the outside which fibers also penetrate the inside of the aerogel beads for mechanical reinforcement.
Claim 15
Dependent Claim
38 words
A molding as defined in claim 1, wherein quartz fibers, aluminum oxide fibers or aluminum silicate fibers having a thickness of up to 10 μm and a length of up to 5 cm are incorporated for further reinforcement.
Claim 16
Dependent Claim
19 words
A molding as defined in claim 1, wherein the dried silica aerogel parts are pressed under a protective gas.
Claim 17
Dependent Claim
13 words
A molding as defined in claim 15, wherein the protective gas in nitrogen.
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) | 1997-03-14 | 1997-09-13 | 1998-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-14 | 2001-09-13 | 2002-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-14 | 2005-09-13 | 2006-03-15 | $7700.00 | Window Closed / Lapsed |