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US2722995A
Expired / Lapsed
US
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Dust removal system
Assignee: Phillips Petroleum Co
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Filing: 1952-12-15
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Granted: 1955-11-08
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Expires: 1972-12-15
Abstract
No abstract record available.
Inventors
- 👤 William R King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:10
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/66; B01D46/74; B01D46/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US569644A
Cited
US1094521A
Cited
FR461145A
Cited
FR518533A
Cited
GB195203A
Cited
US1755011A
Cited
US2085155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |