Patent US2553469A successfully refreshed from Google Patents.
US2553469A
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Method for fractional distillation
Assignee: Gulf Oil Corp
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Filing: 1946-12-26
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Granted: 1951-05-15
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Expires: 1966-12-26
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Pellettere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:59
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; C; C07; C07C; C07C7/00; C07C7/04; F25J2210/00; F25J2210/12; Y; Y10; Y10S; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1563097A
Cited
US1963841A
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US2160898A
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US2423156A
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US2348659A
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US2355589A
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US2456398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |