US2616516A
Expired / Lapsed
US
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Electrofilter
Assignee: Svenska Flaktfabriken AB
•
Filing: 1949-05-03
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Granted: 1952-11-04
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Expires: 1969-05-03
Abstract
No abstract record available.
Inventors
- 👤 Lindbergh John Helge
- 👤 Larsson Gustaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:37
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/86
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |