US2488943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of maintaining acid catalyst concentration in an alkylation process
Assignee: ANGIO IRANIAN OIL Co Ltd
•
Filing: 1944-08-30
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Granted: 1949-11-22
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Expires: 1964-08-30
Abstract
No abstract record available.
Inventors
- 👤 Shearer Alexander Paterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:41
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2001910A
Cited
US2211747A
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US2346770A
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US2341863A
Cited
US2348815A
Cited
US2370164A
Cited
US2396198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |