Patent US2726730A successfully refreshed from Google Patents.
US2726730A
Expired / Lapsed
US
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Gas cleaning device
Assignee: Apra Precipitator Corp
•
Filing: 1949-06-16
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Granted: 1955-12-13
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Expires: 1969-06-16
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Mackenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:16
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1252104A
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US1412248A
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US1730250A
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US1654212A
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FR713691A
Cited
US2061045A
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US2443780A
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US2422564A
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US2582133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-12 | 1959-06-13 | 1959-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-12 | 1963-06-13 | 1963-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-12 | 1967-06-13 | 1967-12-13 | $7700.00 | Window Closed / Lapsed |