US2432873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means of pebble heater control
Assignee: Phillips Petroleum Co
•
Filing: 1947-08-25
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Granted: 1947-12-16
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Expires: 1967-08-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Bernardo J Ferro
- 👤 Church J Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:43
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/14; C; C01; C01B; C01B32/00; C01B32/70; C01C; C01C3/00; C01C3/02; C01C3/0208; C01C3/0237; C10; C10G; C10G11/00; C10G11/14; C10G11/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2374151A
Cited
US2387378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-15 | 1951-06-16 | 1951-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-15 | 1955-06-16 | 1955-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-15 | 1959-06-16 | 1959-12-16 | $7700.00 | Window Closed / Lapsed |