US2807857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of thoria ware
Assignee: National Research Development Corp UK
•
Filing: 1954-09-24
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Granted: 1957-10-01
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Expires: 1974-09-24
Abstract
No abstract record available.
Inventors
- 👤 Murray Peter
- 👤 Wilkinson Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:47
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/51
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
A METHOD OF PRODUCING SLIP-CAST THORIA WARE OF VERY LOW PORE CONTENT, WHICH METHOD CONSISTS IN THE STEPS OF CALCINING THORIA OF A PURITY OF AT LEAST 99.5 PERCENT AT A TEMPERATURE ABOVE 10000*C., MILLING THE CALCINED THORIA TO PRODUCE A PRODUCT HAVING PARTICLE SIZES RANGING UP TO 11 MICRONS AND HAVING SUBSTANTIALLY 60 PERCENT OF PARTICLES LESS THAN 2 MICRONS, FORMING THE MILLED THORIA INTO AN AQUEOUS SLIP, CASTING THE SLIP IN A MOLD AND FIRING THE DRIED CAST AT A SINTERING TEMPERATURE OF THE THORIA.
References Cited (Backward Citations)
US1121889A
Cited
US1554225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |