US2755174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure tight screen in pebble heater unit
Assignee: Phillips Petroleum Co
•
Filing: 1948-01-07
•
Granted: 1956-07-17
•
Expires: 1968-01-07
Abstract
No abstract record available.
Inventors
- 👤 Weber Louis Joe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:29
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/02; C01C3/0208; C01C3/0237; B; B01; B01J; B01J8/00; B01J8/08; B01J8/087; C01B; C01B32/00; C01B32/70; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00026; B01J2208/00035; B01J2208/00088; B01J2208/00327; B01J2208/00336; B01J2208/0038; B01J2208/00513
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1030653A
Cited
US1977684A
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US2290580A
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US2398954A
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US2441170A
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US2434843A
Cited
US2486627A
Cited
US2444258A
Cited
US2432520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |