US2509548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energizing electrical precipitator
Assignee: Research Corp
•
Filing: 1948-05-27
•
Granted: 1950-05-30
•
Expires: 1968-05-27
Abstract
No abstract record available.
Inventors
- 👤 Harry J White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:44
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE537101C
Cited
US1120561A
Cited
US1433699A
Cited
DE551416C
Cited
US2000017A
Cited
GB350205A
Cited
US2000020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |