US2672948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionizing unit for electrostatic filters
Assignee: Trion Inc
•
Filing: 1952-12-09
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Granted: 1954-03-23
•
Expires: 1972-12-09
Abstract
No abstract record available.
Inventors
- 👤 Gaylord W Penney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:41
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2579445A
Cited
US2634818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |