Patent US2418255A successfully refreshed from Google Patents.
US2418255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic dehydrogenation of hydrocarbons
Assignee: Phillips Petroleum Co
•
Filing: 1940-09-09
•
Granted: 1947-04-01
•
Expires: 1960-09-09
Abstract
No abstract record available.
Inventors
- 👤 Frederick E Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:08
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C07C11/08; C07C11/09; C07C5/00; C07C5/32; C07C5/321; C07C5/327; C07C5/333
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2183591A
Cited
US2125714A
Cited
US2129142A
Cited
US2161247A
Cited
US2216470A
Cited
US2127953A
Cited
US2249924A
Cited
US2273089A
Cited
US2209458A
Cited
US2331427A
Cited
US2278223A
Cited
US2349045A
Cited
US2366567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-31 | 1950-09-30 | 1951-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-31 | 1954-09-30 | 1955-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-31 | 1958-09-30 | 1959-04-01 | $7700.00 | Window Closed / Lapsed |