Patent US2531143A successfully refreshed from Google Patents.
US2531143A
Expired / Lapsed
US
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Method of purifying beryllium oxide
Assignee: Individual
•
Filing: 1948-11-19
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Granted: 1950-11-21
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Expires: 1968-11-19
Abstract
No abstract record available.
Inventors
- 👤 John G Malm
- 👤 Jr Clyde A Hutchison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:45
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/08; C01; C01F; C01F3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A PROCESS FOR THE PURIFICATION OF BERYLLIA FROM THE IMPURITIES NORMALLY ASSOCIATED THEREWITH, COMPRISING HEATING SAID BERYLLIA IN CONTACT WITH STEAM TO A TEMPERATURE FROM 1000*C. TO THE MELTING POINT OF BERYLLIA AND COOLING THE RE-
Claim 2
Dependent Claim
36 words
A PROCESS FOR THE PURIFICATION OF BERYLLIA FROM THE IMPURITIES NORMALLY ASSOCIATED THEREWITH, COMPRISING HEATING SAID BERYLLIA IN CONTACT WITH STEAM TO A TEMPERATURE FROM 1000*C. TO THE MELTING POINT OF BERYLLIA AND COOLING THE RE-
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |