US2806744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Straightening vanes in pebble heater air lift
Assignee: Phillips Petroleum Co
•
Filing: 1954-12-03
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Granted: 1957-09-17
•
Expires: 1974-12-03
Abstract
No abstract record available.
Inventors
- 👤 Dick S Hall
- 👤 Lloyd E Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/14; B; B01; B01J; B01J8/00; B01J8/0015; B01J8/0025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2542887A
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US914105A
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US1827727A
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US2694605A
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US2695265A
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US2695815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |