US2659449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Humidifying system for dust and fume collection by electrical precipitation
Assignee: CalPortland Co
•
Filing: 1950-04-03
•
Granted: 1953-11-17
•
Expires: 1970-04-03
Abstract
No abstract record available.
Inventors
- 👤 Harry E Kaiser
- 👤 William C Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:07
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/01; B03C3/014
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1790961A
Cited
US1204906A
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US1185136A
Cited
DE553176C
Cited
US1909825A
Cited
GB333048A
Cited
US1820726A
Cited
US2382253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |