US3594331A
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US
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Method of increasing the thermal stability of crystalline zeolites
Assignee: WR Grace and Co
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Filing: 1969-02-27
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Granted: 1971-07-20
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Expires: 1989-02-27
Abstract
Abstract METHODS OF INCREASING THE THERMAL STABILITY OF CRYSTALLINE ZEOLITES ARE DISCLOSED. THE METHODS ARE CHARACTERIZED BY THE STEPS OF TREATING THE CRYSTALLINE ZEOLITE WITH A DILUTE SOLUTION F A FLUORINE COMPOUND WHEREBY A VERY SMALL AMOUNT OF FLUORIDE IS INCORPORATED IN THE ZEOLITE.
Inventors
- 👤 Curtis H Elliott Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:34
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/084; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; B01J29/082; B01J29/70; B01J29/7003
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |