US2439934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing aromatic hydrocarbons
Assignee: Phillips Petroleum Co
•
Filing: 1944-10-30
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Granted: 1948-04-20
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Expires: 1964-10-30
Abstract
No abstract record available.
Inventors
- 👤 Paul H Johnson
- 👤 Robert R Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:19
CPC Classifications
C; C07; C07C; C07C15/00; B; B01; B01J; B01J8/00; B01J8/02; B01J8/04; B01J8/0446; B01J8/0449; B01J8/0453; C07C5/00; C07C5/32; C07C5/327; C07C5/373; C07C5/393; C07C5/41; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00327; B01J2208/00336
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |