US3548023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor pressure control in a fractionator of an alkylation process
Assignee: Phillips Petroleum Co
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Filing: 1968-05-17
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Granted: 1970-12-15
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Expires: 1988-05-17
Abstract
No abstract record available.
Inventors
- 👤 Luther F Mayhue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:39
CPC Classifications
C; C07; C07C; C07C9/00; C07C9/14; C07C9/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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 |