US4404291A
Expired / Lapsed
US
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Low-density, open-pore molded inorganic body with a homogeneous pore distribution
Assignee: Schott AG
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Filing: 1982-02-03
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Granted: 1983-09-13
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Expires: 2002-02-03
Abstract
Abstract A novel low density molded porous sintered body contains at least 90% open pores having a specific diameter distributed equally in all directions. The material of the molded body is preferably a vitreous and/or crystalline and/or ceramic substance having a low thermal coefficient of expansion.
Inventors
- 👤 Werner Kiefer
- 👤 Maria Sura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:19
CPC Classifications
C; C03; C03B; C03B19/00; C03B19/06; C03C; C03C11/00; C04; C04B; C04B38/00; C04B38/06; C04B38/063; C04B38/0635; C04B38/0645; C04B38/065
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
52 words
A molded sintered porous body comprising at least one of: a conventional glass, a solder glass or a crystallized solder glass, said body having more than 90% of the pores therein of the open-type, said pores being isotropically distributed, and said body having a density of less than 1.0 g/cm 3 .
Claim 2
Dependent Claim
52 words
A molded sintered porous body comprising at least one of: a conventional glass, a solder glass or a crystallized solder glass, said body having more than 90% of the pores therein of the open-type, said pores being isotropically distributed, and said body having a density of less than 1.0 g/cm 3 .
Claim 3
Dependent Claim
17 words
A molded body according to claim 1, wherein more than 99% of the pores are open pores.
Claim 4
Dependent Claim
21 words
A molded body according to claim 1, wherein the density of the molded body is less than 0.3 g/cm 3 .
Claim 5
Dependent Claim
23 words
A molded body according to claim 1, wherein the porous sintered material comprises 20-50% by weight of borosilicate glass or 5-30% solder glass.
Claim 6
Dependent Claim
28 words
A molded body according to claim 1, wherein the porous sintered material comprises a crystallized solder glass, and at least one of a glass ceramic and a ceramic.
Claim 7
Dependent Claim
30 words
A molded body according to claim 1, wherein the porous sintered material comprises at least two of the following: a conventional glass, crystallized solder glass, glass ceramic and ceramic substance.
Claim 8
Dependent Claim
15 words
A molded body according to claim 1, wherein all pores are uniformly the same size.
Claim 9
Dependent Claim
24 words
A molded body according to claim 1, wherein the total number of pores consists essentially of uniformly distributed pores of at least two sizes.
Claim 10
Dependent Claim
24 words
A molded body according to claim 1, wherein the molded body comprises additional cavities which are at least 10 times larger than the pores.
Claim 11
Dependent Claim
31 words
A molded body according to claim 5, wherein the crystalline phase of the crystallized solder glass, of the glass ceramic and of the ceramic substance consists essentially of high-quartz mixed crystals.
Claim 12
Dependent Claim
43 words
A molded body according to claim 6, wherein the quantitative ratio between the glass phase and the crystal phase and their composition are so selected that the molded body exhibits a linear thermal expansion coefficient α 20-300 of less than 1×10 -6 /K.
Claim 13
Dependent Claim
23 words
A molded body according to claim 11, wherein the molded body exhibits a linear thermal expansion coefficient α 20-100 of 0±0.1×10 -6 /K.
Claim 14
Dependent Claim
93 words
A process for producing a molded sintered porous body according to claim 1, said process comprising providing said at least one of: a conventional glass, a solder glass, or a crystallizing solder glass, in powder form; admixing to said powder an organic combustible substance; annealing resultant admixture to a temperature sufficient to burn off said organic substance to form open pores in the resultant mass; further heating the resultant mass at a temperature and for a sufficient time such that the powder sinters together and the pores remain open during the sintering process.
Claim 15
Dependent Claim
26 words
A process according to claim 1, wherein said powder has a particle size of less than 200 microns, and the organic substance comprises foamed plastic balls.
Claim 16
Dependent Claim
13 words
A process according to claim 13, said powder being a crystallizing solder glass.
Claim 17
Dependent Claim
27 words
A molded sintered body according to claim 1, consisting essentially of a ceramic and 5-25% by weight in total of a conventional glass and/or crystallized solder glass.
Claim 18
Dependent Claim
18 words
A molded sintered body according to claim 1, consisting essentially of a glass ceramic and a conventional glass.
Claim 19
Dependent Claim
19 words
A molded sintered body according to claim 1, consisting essentially of a glass ceramic and a crystallizing solder glass.
Claim 20
Dependent Claim
43 words
A molded body according to claim 5, wherein the quantitative ratio between the glass phase and the crystal phase and their composition are so selected that the molded body exhibits a linear thermal expansion coefficient α 20-300 of less than 1×10 -6 /K.
Claim 21
Dependent Claim
43 words
A molded body according to claim 16, wherein the quantitative ratio between the glass phase and the crystal phase and their composition are so selected that the molded body exhibits a linear thermal expansion coefficient α 20-300 of less than 1×10 -6 /K.
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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |