US2857978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroprecipitator
Assignee: Individual
•
Filing: 1955-07-22
•
Granted: 1958-10-28
•
Expires: 1975-07-22
Abstract
No abstract record available.
Inventors
- 👤 Vladimir J Lenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:28
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/40; B03C3/45; B03C3/49
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1365978A
Cited
US1444845A
Cited
US1575165A
Cited
US2307602A
Cited
US2409579A
Cited
US2484202A
Cited
US2637408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |