US2455003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation of paraffins in presence of hydrofluoric acid
Assignee: Phillips Petroleum Co
•
Filing: 1941-12-23
•
Granted: 1948-11-30
•
Expires: 1961-12-23
Abstract
No abstract record available.
Inventors
- 👤 Frederick E Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:13
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/62; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1206
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB292932A
Cited
US2098045A
Cited
US2174118A
Cited
US2283603A
Cited
US2275312A
Cited
US2267730A
Cited
US2322800A
Cited
US2320629A
Cited
US2388918A
Cited
US2378636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-30 | 1952-05-31 | 1952-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-30 | 1956-05-31 | 1956-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-30 | 1960-05-31 | 1960-11-30 | $7700.00 | Window Closed / Lapsed |