US3311461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing rare earthcontaining glass polishing agents
Assignee: American Potash and Chemical Corp
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Filing: 1964-06-15
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Granted: 1967-03-28
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Expires: 1984-06-15
Abstract
No abstract record available.
Inventors
- 👤 Walter L Silvernail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:58
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1454
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS FOR PRODUCING A RARE EARTH-CONTAINING GLASS POLISHING AGENT WHICH CONSISTS ESSENTIALLY OF PULVERIZING A BASTNASITE CONCENTRATE CONTAINING FROM ABOUT 15 TO 99 WEIGHT PERCENT RARE EARTH OXIDE TO A PARTICLE SIZE OF 0.1 TO 20 MICRONS, INTRODUCING ONLY THE PULVERIZED CONCENTRATE INTO A HEATING ZONE AND IGNITING ONLY THE CONCENTRATE AT A TEMPERATURE OF FROM ABOUT 800 TO 2,000*F. FOR A PERIOD OF TIME SUFFICIENT TO PRODUCE A RARE EARTHCONTAINING GLASS POLISHING AGENT AND RECOVERING THE POLISHING AGENT SO PRODUCED.
Claim 2
Dependent Claim
82 words
A PROCESS FOR PRODUCING A RARE EARTH-CONTAINING GLASS POLISHING AGENT WHICH CONSISTS ESSENTIALLY OF PULVERIZING A BASTNASITE CONCENTRATE CONTAINING FROM ABOUT 15 TO 99 WEIGHT PERCENT RARE EARTH OXIDE TO A PARTICLE SIZE OF 0.1 TO 20 MICRONS, INTRODUCING ONLY THE PULVERIZED CONCENTRATE INTO A HEATING ZONE AND IGNITING ONLY THE CONCENTRATE AT A TEMPERATURE OF FROM ABOUT 800 TO 2,000*F. FOR A PERIOD OF TIME SUFFICIENT TO PRODUCE A RARE EARTHCONTAINING GLASS POLISHING AGENT AND RECOVERING THE POLISHING AGENT SO PRODUCED.
References Cited (Backward Citations)
US3131039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |