US2683689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for treating granular material through action of electrostatic corona
Assignee: Individual
•
Filing: 1949-03-28
•
Granted: 1954-07-13
•
Expires: 1969-03-28
Abstract
No abstract record available.
Inventors
- 👤 Henry J Nicholls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:33
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/50; A23B2/505; A23B9/00; A23B9/06; A24; A24B; A24B3/00; A24B3/18
Claims Analysis
Total Claims: 0
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US2254016A
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US2500728A
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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) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |