Patent US2973278A successfully refreshed from Google Patents.
US2973278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of sintered vitreous silica
Assignee: Individual
•
Filing: 1958-05-15
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Granted: 1961-02-28
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Expires: 1978-05-15
Abstract
No abstract record available.
Inventors
- 👤 Gerhard E Kadisch
- 👤 Jakubczak Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:25
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
THE METHOD OF MAKING SOLID SILICEOUS ARTICLES CONSISTING ESSENTIALLY OF SINTERED VITREOUS SILICA, COMPRISING FORMING A MIXTURE CONSISTING ESSENTIALLY OF FINELY DIVIDED SUBSTANTIALLY PURE VITREOUS SILICA AND FINELY DIVIDED BORIC OXIDE IN A MINOR AMOUNT EFFECTIVE TO PREVENT DEVITRIFICATION OF THE SILICA, PLACING THE MIXTURE WITHIN A HEATING ZONE, AND HEATING THE MIXTURE IN A PROTECTIVE ATMOSPHERE TO PREVENT DEVITRIFICATION WITHOUT MELTING IT TO A TEMPERATURE BETWEEN ABOUT 1900*F. AND 2500*F. UNTIL THE MIXTURE IS SINTERED TO A COMPACT VIREOUS SOLID BODY.
Claim 2
Independent Claim
82 words
THE METHOD OF MAKING SOLID SILICEOUS ARTICLES CONSISTING ESSENTIALLY OF SINTERED VITREOUS SILICA, COMPRISING FORMING A MIXTURE CONSISTING ESSENTIALLY OF FINELY DIVIDED SUBSTANTIALLY PURE VITREOUS SILICA AND FINELY DIVIDED BORIC OXIDE IN A MINOR AMOUNT EFFECTIVE TO PREVENT DEVITRIFICATION OF THE SILICA, PLACING THE MIXTURE WITHIN A HEATING ZONE, AND HEATING THE MIXTURE IN A PROTECTIVE ATMOSPHERE TO PREVENT DEVITRIFICATION WITHOUT MELTING IT TO A TEMPERATURE BETWEEN ABOUT 1900*F. AND 2500*F. UNTIL THE MIXTURE IS SINTERED TO A COMPACT VIREOUS SOLID BODY.
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) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |