Patent US2839155A successfully refreshed from Google Patents.
US2839155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal precipitator
Assignee: Individual
•
Filing: 1956-01-05
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Granted: 1958-06-17
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Expires: 1976-01-05
Abstract
No abstract record available.
Inventors
- 👤 Roy A Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:23
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/26; B01D49/00; B01D49/02; G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2202; G01N2001/222; G01N2001/2223
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |