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US2810562A
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Frusto-conical fractionation tray having perforated and non-perforated sections
Assignee: Gulf Oil Corp
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Filing: 1952-11-28
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Granted: 1957-10-22
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Expires: 1972-11-28
Abstract
No abstract record available.
Inventors
- 👤 Aksel C Eld
- 👤 John R Guala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:20
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D3/00; B01D3/14; B01D3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US757757A
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US999213A
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US1480888A
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US2005316A
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US2051545A
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US2105501A
Cited
US2702741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |