US2650672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic precipitator
Assignee: Westinghouse Electric Corp
•
Filing: 1948-04-06
•
Granted: 1953-09-01
•
Expires: 1968-04-06
Abstract
No abstract record available.
Inventors
- 👤 Robert L Barr
- 👤 Elmer G Hills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:29
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US670169A
Cited
DE360119C
Cited
US1992974A
Cited
US2233639A
Cited
US2486520A
Cited
US2528842A
Cited
US2449681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |