US3049848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic precipitator circuits
Assignee: Apra Precipitator Corp
•
Filing: 1953-08-17
•
Granted: 1962-08-21
•
Expires: 1973-08-17
Abstract
No abstract record available.
Inventors
- 👤 Klemperer Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:09
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66; B03C3/68; E; E21; E21B; E21B10/00; E21B10/46; E21B10/48; Y; Y10; Y10S; Y10S323/00; Y10S323/903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2084870A
Cited
GB521316A
Cited
US2297841A
Cited
US2582133A
Cited
US2609061A
Cited
US2623608A
Cited
US2765436A
Cited
US2632522A
Cited
US2704134A
Cited
US2798571A
Cited
US2764254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |