Patent US2802750A successfully refreshed from Google Patents.
US2802750A
Expired / Lapsed
US
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Method of making phosphate bonded silica refractory body
Assignee: Illinois Clay Products Co
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Filing: 1954-10-12
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Granted: 1957-08-13
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Expires: 1974-10-12
Abstract
No abstract record available.
Inventors
- 👤 John H Veale
- 👤 Howard F West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:11
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
62 words
THE METHOD OF MAKING A SILICA BRICK WHICH COMPRISES MIXING GRANULATED ALPHA QUARTZ PARTICLES WITH ORTHOPHOSPHORIC ACID AND A CALCIUM PHOSPHATE, THE AMOUNT OF PHOSPHATE AND ORTHOPHOSPHORIC ACID BEING SUCH AS TO GIVE A P2O5 CONTENT OF ABOUT 4-15% BY WEIGHT OF THE MIXTURE, WATER BEING PRESENT IN A WEIGHT RATIO OF H2O TO H3PO4 OF NOT MORE THAN ONE TO THREE.
Claim 2
Independent Claim
62 words
THE METHOD OF MAKING A SILICA BRICK WHICH COMPRISES MIXING GRANULATED ALPHA QUARTZ PARTICLES WITH ORTHOPHOSPHORIC ACID AND A CALCIUM PHOSPHATE, THE AMOUNT OF PHOSPHATE AND ORTHOPHOSPHORIC ACID BEING SUCH AS TO GIVE A P2O5 CONTENT OF ABOUT 4-15% BY WEIGHT OF THE MIXTURE, WATER BEING PRESENT IN A WEIGHT RATIO OF H2O TO H3PO4 OF NOT MORE THAN ONE TO THREE.
References Cited (Backward Citations)
US1420284A
Cited
GB674247A
Cited
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 |