Patent US3454354A successfully refreshed from Google Patents.
US3454354A
Expired / Lapsed
US
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Removal of sulfur dioxide from flue gas
Assignee: Peter Spence and Sons Ltd
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Filing: 1966-04-05
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Granted: 1969-07-08
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Expires: 1986-04-05
Abstract
No abstract record available.
Inventors
- 👤 John Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:26
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8603; B01D53/8609; B01D53/46; B01D53/48; B01D53/50; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0426; C01B17/0443; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
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) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |