US2696892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas humidifying and electrical precipitation system
Assignee: CalPortland Co
•
Filing: 1951-06-08
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Granted: 1954-12-14
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Expires: 1971-06-08
Abstract
No abstract record available.
Inventors
- 👤 William C Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:49
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/01; B03C3/014; B01; B01D; B01D47/00; B01D47/06; B03C3/02; B03C3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1966859A
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US2503002A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-13 | 1958-06-14 | 1958-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-13 | 1962-06-14 | 1962-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-13 | 1966-06-14 | 1966-12-14 | $7700.00 | Window Closed / Lapsed |