US2443423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for conducting endothermic catalytic conversions
Assignee: Phillips Petroleum Co
•
Filing: 1946-04-29
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Granted: 1948-06-15
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Expires: 1966-04-29
Abstract
No abstract record available.
Inventors
- 👤 Carl J Helmers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:37
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/0285; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00132; B01J2219/00139
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1688679A
Cited
US2406640A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-15 | 1951-12-15 | 1952-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-15 | 1955-12-15 | 1956-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-15 | 1959-12-15 | 1960-06-15 | $7700.00 | Window Closed / Lapsed |