Patent US3841856A successfully refreshed from Google Patents.
US3841856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of production of white divitrified glass material
Assignee: Individual
•
Filing: 1972-11-14
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Granted: 1974-10-15
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Expires: 1992-11-14
Abstract
Abstract For the production of white devitrified glass material, there is melted a melt having the composition thereof within a CaO - MgO Al2O3 - SiO2 system, whereafter there is used for working the melt opacified by phase demixing, and the formed glass band is crystallized in a single-stage process in accordance with which the glass is heated up at a rate of 5*C. to 10*C. to a temperature of 1050*C. to 1080*C., cured at this temperature for no more than an hour, and then cooled down to the vitrification point.
Inventors
- 👤 N Pavlushkin
- 👤 G Kataeva
- 👤 V Kozlovsky
- 👤 M Romanovsky
- 👤 V Pyatnitskaya
- 👤 S Rud
- 👤 K Bondarev
- 👤 I Tykachinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:16
CPC Classifications
C; C03; C03B; C03B25/00; C03B25/04; C03B25/06; C03B25/08; C03B25/093; C03B13/00; C03B13/04; C03B18/00; C03B18/02; C03B18/16; C03B18/18; C03B32/00; C03B32/02; C03C; C03C10/00; C03C10/0036; C03C10/0045
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
A METHOD FIROR THE PRODUCTION OF WHITE DEVITRIFIED GLASS MATERIAL COMPRISING THE STEPS OF MELTING NATURAL BATCH MATERIALS OF SAND, LIMESTONE, CHALK, CLAY AND BROKENT GLASS AND FORMING A GLASS MELT HAVING A COMPOSITION OF SIO2, CAO, MGO, AL2O3 AND NA2O, HEATING SAID MELT TO TEMPERATURES FROM 1,410*C. TO 1.450*C. AND OPCIFYING SAID MELT BY PHASE DEMIXING, FORMING A GLASS BAND OF SAID MELT, HEATING SAID GLASS BAND TO A TEMPERATURE FROM 1,050*C. TO 1,080*C. AT A RATE OF 5*C.
Claim 2
Independent Claim
80 words
A METHOD FIROR THE PRODUCTION OF WHITE DEVITRIFIED GLASS MATERIAL COMPRISING THE STEPS OF MELTING NATURAL BATCH MATERIALS OF SAND, LIMESTONE, CHALK, CLAY AND BROKENT GLASS AND FORMING A GLASS MELT HAVING A COMPOSITION OF SIO2, CAO, MGO, AL2O3 AND NA2O, HEATING SAID MELT TO TEMPERATURES FROM 1,410*C. TO 1.450*C. AND OPCIFYING SAID MELT BY PHASE DEMIXING, FORMING A GLASS BAND OF SAID MELT, HEATING SAID GLASS BAND TO A TEMPERATURE FROM 1,050*C. TO 1,080*C. AT A RATE OF 5*C.
Claim 3
Dependent Claim
18 words
A method according to claim 1, wherein the glass band is supported on an air-gas mixture during crystallization.
Claim 4
Dependent Claim
19 words
A method according to claim 1, wherein the glass band is supported on a molten metal surface during crystallization.
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |