Patent US2802749A successfully refreshed from Google Patents.
US2802749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemically bonded silica brick
Assignee: Illinois Clay Products Co
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Filing: 1953-05-18
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Granted: 1957-08-13
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Expires: 1973-05-18
Abstract
No abstract record available.
Inventors
- 👤 Howard F West
- 👤 John H Veale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:57
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315; C04B35/00; C04B35/01; C04B35/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
THE METHOD OF MAKING A SILICA REFRACTORY BODY WHICH COMPRISES MIXING PARTICLES OF ALPHA QUARTZ WITH 4-10% BY WEIGHT OF PYROPHOSPHORIC ACID, FORMING THE MIXTURE INTO A SHAPED BODY, AND HEATING THE BODY AT A TEMPERATURE OF APPROXIMATELY 700*F. TO FORM A BOND OF WATER RESISTANT SILICON PHOSPHATE.
Claim 2
Independent Claim
48 words
THE METHOD OF MAKING A SILICA REFRACTORY BODY WHICH COMPRISES MIXING PARTICLES OF ALPHA QUARTZ WITH 4-10% BY WEIGHT OF PYROPHOSPHORIC ACID, FORMING THE MIXTURE INTO A SHAPED BODY, AND HEATING THE BODY AT A TEMPERATURE OF APPROXIMATELY 700*F. TO FORM A BOND OF WATER RESISTANT SILICON PHOSPHATE.
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) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |