Patent US3533748A successfully refreshed from Google Patents.
US3533748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of sulfur oxides from waste gases
Assignee: Chemical Construction Corp
•
Filing: 1967-12-15
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Granted: 1970-10-13
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Expires: 1987-12-15
Abstract
No abstract record available.
Inventors
- 👤 Edward Z Finfer
- 👤 Howard P Willett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:30
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1865754A
Cited
US2177707A
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US2780307A
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US2994588A
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US3111377A
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US3148950A
Cited
US3438733A
Cited
US3438734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |