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Patent US3547597A successfully refreshed from Google Patents.
US3547597A
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Method for producing high-purity crystals using serially connected crystallization zones
Assignee: Phillips Petroleum Co
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Filing: 1967-05-22
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Granted: 1970-12-15
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Expires: 1987-05-22
Abstract
No abstract record available.
Inventors
- 👤 George E Hays
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:37
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/12; C07D487/18; B; B01; B01D; B01D9/00; B01D9/0036; B01D9/0059
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1635707A
Cited
US1907987A
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US2389732A
Cited
US2552524A
Cited
US2962348A
Cited
US3019611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |