US3883337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a glass object by molding and sintering glass powder
Assignee: Stig Arbman AB
•
Filing: 1973-04-18
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Granted: 1975-05-13
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Expires: 1993-04-18
Abstract
Abstract In the disclosed method of manufacturing glass objects by molding and sintering glass powder, a layer of colloidal silica is applied onto the surface of the glass particles of the powder prior to molding and sintering.
Inventors
- 👤 Claes Ivar Helgesson
- 👤 Sven Borje Stellan Persson
- 👤 Hans-Olof Ingvar Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:55
CPC Classifications
C; C03; C03C; C03C10/00; C03B; C03B19/00; C03B19/06; C03C10/0036; C03C10/0045; C03C12/00
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
85 words
IN A METHOD OF MANUFACTURING A GLASS OBJECT, WHEREIN GLASS POWDER IS MOLDED AND SINTERED, THE IMPROVEMENT WHICH COMPRISES THAT, PRIOR TO THE MOLDING AND SINTERING, THE GLASS POWDER PARTICLES ARE COATED WITH COLLOIDAL SILICA, SAID COATING BEING EFFECTED BY PLACING THE GLASS POWDER IN AN ALKALINE SILICATE SOLUTION, THEREUPON ACIDIFYING THE SOLUTION TO A PH VALUE AT WHICH COOLOIDAL SILICA PRECIPITATES, WHEREBY SAID COLLOIDAL SILICA DEPOSITS ON THE SURFACES OF THE GLASS PARTICLES, TO COAT THE LATTER, AND FINALLY DRYING THE COATED GLASS POWDER.
Claim 2
Dependent Claim
85 words
IN A METHOD OF MANUFACTURING A GLASS OBJECT, WHEREIN GLASS POWDER IS MOLDED AND SINTERED, THE IMPROVEMENT WHICH COMPRISES THAT, PRIOR TO THE MOLDING AND SINTERING, THE GLASS POWDER PARTICLES ARE COATED WITH COLLOIDAL SILICA, SAID COATING BEING EFFECTED BY PLACING THE GLASS POWDER IN AN ALKALINE SILICATE SOLUTION, THEREUPON ACIDIFYING THE SOLUTION TO A PH VALUE AT WHICH COOLOIDAL SILICA PRECIPITATES, WHEREBY SAID COLLOIDAL SILICA DEPOSITS ON THE SURFACES OF THE GLASS PARTICLES, TO COAT THE LATTER, AND FINALLY DRYING THE COATED GLASS POWDER.
Claim 3
Dependent Claim
29 words
The improvement of claim 1, wherein the quantity of colloidal silica which is coated onto the glass powder particles is 0.01 to 0.1 gram per m2 of glass surfaces.
Claim 4
Dependent Claim
21 words
The improvement of claim 1, wherein said glass powder particles have a particle size of about 0.5 to 50 Mu m.
Claim 5
Dependent Claim
20 words
The improvement as claimed in claim 1, wherein said alkaline silicate solution has a concentration of about 0.1 to 1N.
Claim 6
Dependent Claim
63 words
The improvement of claim 1, for the manufacture of an object of crystallized glass, wherein a quantity of crystal seed material is mixed with the glass powder, said seed material being in the form of a powderous crystalline material having a crystal structure corresponding to the structure of the primary or secondary crystalline phase in the phase system of the glass in question.
Claim 7
Dependent Claim
31 words
The improvement of claim 5, wherein said crystal seed material is mixed with said glass powder in an amount of 0.5 to 10% calculated on the weight of the glass powder.
Claim 8
Dependent Claim
25 words
The improvement of claim 5, wherein said crystal seed material has a particle size which is smaller than the particle size of the glass powder.
Claim 9
Dependent Claim
27 words
The improvement of claim 7, wherein the particle size of the crystal seed material is about 1/10 to 1/100 of the particle size of the glass powder.
Claim 10
Dependent Claim
28 words
IN A METHOD OF MANUFACTURING A GLASS OBJECT, WHEREIN GLASS POWDER IS MOLDED AND SINTERED, THE IMPROVEMENT WHICH COMPRISES THAT, PRIOR TO THE MOLDING AND SINTERING, THE SURFACES
Claim 11
Dependent Claim
28 words
IN A METHOD OF MANUFACTURING A GLASS OBJECT, WHEREIN GLASS POWDER IS MOLDED AND SINTERED, THE IMPROVEMENT WHICH COMPRISES THAT, PRIOR TO THE MOLDING AND SINTERING, THE SURFACES
Claim 12
Dependent Claim
32 words
The improvement of claim 9, wherein said colloidal silica is coated onto the glass particles, by moistening the glass particles with a colloidal solution of silica, whereupon the glass powder is dried.
Claim 13
Dependent Claim
28 words
The improvement of claim 8, wherein the quantity of colloidal silica which is coated onto the glass particles is 0.01 to 0.1 grams per m2 of glass surfaces.
Claim 14
Dependent Claim
21 words
The improvement of claim 9, wherein said glass powder particles have a particle size of about 0.5 to 50 Mu m.
Claim 15
Dependent Claim
22 words
The improvement of claim 9, wherein the etching is performed by treating the glass powder with an aqueous solution of hydrogen fluoride.
Claim 16
Dependent Claim
20 words
The improvEment of claim 9, wherein the etching is performed by treating the glass powder with an alkaline aqueous solution.
Claim 17
Dependent Claim
16 words
The improvement of claim 14, wherein said alkaline aqueous solution is an aqueous sodium hydroxide solution.
Claim 18
Dependent Claim
63 words
The improvement of claim 9 for the manufacture of an object of crystallized glass, wherein a quantity of crystal seed material is mixed with the glass powder, said seed material being in the form of a powderous crystalline material having a crystal structure corresponding to the structure of the primary or secondary crystalline phase in the phase system of the glass in question.
Claim 19
Dependent Claim
31 words
The improvement of claim 16, wherein said crystal seed material is mixed with said glass powder in an amount of 0.5 to 10% calculated on the weight of the glass powder.
Claim 20
Dependent Claim
25 words
The improvement of claim 16, wherein said crystal seed material has a particle size which is smaller than the particle size of the glass powder.
Claim 21
Dependent Claim
27 words
The improvement of claim 18, wherein the particle size of the crystal seed material is about 1/10 to 1/100 of the particle size of the glass powder.
Claim 22
Dependent Claim
83 words
IN A METHOD OF MANUFACTURING A GLASS OBJECT, WHEREIN GLASS POWDER IS MOLDED AND SINTERED, THE IMPROVEMENT WHICH COMPRISES THAT, PRIOR TO THE MOLDING AND SINTERING, THE SURFACES OF THE GLASS POWDER PARTICLES ARE ETCHED BY TREATING THE GLASS POWDER WITH AN AQUEOUS ALKALINE SOLUTION, WHEREBY A QUANTITY OF GLASS IS DISSOLVED BY THE SOLUTION IN THE FOM OF SILICATE, AND ACIDIFYING THE SOLUTION, WHEREUPON SAID SILICATE DEPOSITS ON THE SURFACES OF THE GLASS PARTICLES IN THE FORM OF A COLLOIDAL SILICA COATING.
Claim 23
Dependent Claim
83 words
IN A METHOD OF MANUFACTURING A GLASS OBJECT, WHEREIN GLASS POWDER IS MOLDED AND SINTERED, THE IMPROVEMENT WHICH COMPRISES THAT, PRIOR TO THE MOLDING AND SINTERING, THE SURFACES OF THE GLASS POWDER PARTICLES ARE ETCHED BY TREATING THE GLASS POWDER WITH AN AQUEOUS ALKALINE SOLUTION, WHEREBY A QUANTITY OF GLASS IS DISSOLVED BY THE SOLUTION IN THE FOM OF SILICATE, AND ACIDIFYING THE SOLUTION, WHEREUPON SAID SILICATE DEPOSITS ON THE SURFACES OF THE GLASS PARTICLES IN THE FORM OF A COLLOIDAL SILICA COATING.
Claim 24
Dependent Claim
21 words
The improvement of claim 20, wherein said glass powder particles have a particle size of about 0.5 to 50 Mu m.
Claim 25
Dependent Claim
63 words
The improvement of claim 20 for the manufacture of an object of crystallized glass, wherein a quantity of crystal seed material is mixed with the glass powder, said seed material being in the form of a powderous crystalline material having a crystal structure corresponding to the structure of the primary or secondary crystalline phase in the phase system of the glass in question.
Claim 26
Dependent Claim
31 words
The improvement of claim 22, wherein said crystal seed material is mixed with said glass powder in an amount of 0.5 to 10% calculated on the weight of the glass powder.
Claim 27
Dependent Claim
25 words
The improvement of claim 22, wherein said crystal seed material has a particle size which is smaller than the particle size of the glass powder.
Claim 28
Dependent Claim
27 words
The improvement of claim 24, wherein the particle size of the crystal seed material is about 1/10 to 1/100 of the particle size of the glass powder.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |