US3494099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for purifying polluted gases
Assignee: Electro-Sonic Pollution Control
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Filing: 1967-08-30
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Granted: 1970-02-10
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Expires: 1987-08-30
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Eng
- 👤 Stanley C F Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:18
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; B01D47/08; B05; B05B; B05B17/00; B05B17/04; B05B17/06; B05B17/0607; F; F23; F23J; F23J15/00; F23J15/02; F23J2215/00; F23J2215/20; F23J2217/00; F23J2217/50; Y; Y10; Y10S; Y10S261/00; Y10S261/09; Y10S261/48; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB301930A
Cited
US3040497A
Cited
US2935375A
Cited
US3026966A
Cited
US3395510A
Cited
US3389971A
Cited
US3390869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |