US3481289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing sulfur dioxide from flue gases of a combustion furnace
Assignee: Central Research Institute of Electric Power Industry
•
Filing: 1968-05-13
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Granted: 1969-12-02
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Expires: 1988-05-13
Abstract
No abstract record available.
Inventors
- 👤 Kenichi Oda
- 👤 Yoshimi Ishihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:06
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB878723A
Cited
US3320906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |