US3190732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zone refining methods and apparatus
Assignee: Clevite Corp
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Filing: 1960-11-22
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Granted: 1965-06-22
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Expires: 1980-11-22
Abstract
No abstract record available.
Inventors
- 👤 Noble E Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:13
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A CONTINUOUS ZONE REFINING PROCESS WHEREIN A CHARGE OF FUSIBLE MATERIAL IS MOVED AT A PREDETERMINED RATE RELATIVE TO A HEATING DEVICE TO CAUSE A LIQUID ZONE TO TRAVERSE THE CHARGE, THE STEP OF INSERTING A MASS OF FIBROUS MATERIAL IN THE LIQUID ZONE OF THE MATERIAL BEING REFINED TO PREVENT MIXING OF LIQUIDS FROM THE EXTREMES OF THE ZONE, THE FIBROUS MATERIAL BEING INSOLUBLE IN THE LIQUID ZONE, CHEMICALLY NON-REACTIVE WITH THE CHARGE MATERIAL, NON-SUBLIMABLE AT THE MAXIMUM TEMPERATURE OF THE LIQUID ZONE AND HAVING A MELTING TEMPERATURE HIGHER THAN THE MAXIMUM TEMPERATURE OF THE LIQUD ZONE.
Claim 2
Dependent Claim
99 words
IN A CONTINUOUS ZONE REFINING PROCESS WHEREIN A CHARGE OF FUSIBLE MATERIAL IS MOVED AT A PREDETERMINED RATE RELATIVE TO A HEATING DEVICE TO CAUSE A LIQUID ZONE TO TRAVERSE THE CHARGE, THE STEP OF INSERTING A MASS OF FIBROUS MATERIAL IN THE LIQUID ZONE OF THE MATERIAL BEING REFINED TO PREVENT MIXING OF LIQUIDS FROM THE EXTREMES OF THE ZONE, THE FIBROUS MATERIAL BEING INSOLUBLE IN THE LIQUID ZONE, CHEMICALLY NON-REACTIVE WITH THE CHARGE MATERIAL, NON-SUBLIMABLE AT THE MAXIMUM TEMPERATURE OF THE LIQUID ZONE AND HAVING A MELTING TEMPERATURE HIGHER THAN THE MAXIMUM TEMPERATURE OF THE LIQUD ZONE.
References Cited (Backward Citations)
US2789039A
Cited
US2890940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |