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US2418167A
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Recovery of so2 from digester blowoff gases
Assignee: Paper Patents Co
•
Filing: 1940-10-05
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Granted: 1947-04-01
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Expires: 1960-10-05
Abstract
No abstract record available.
Inventors
- 👤 Bois Horace A Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:06
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/06; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-31 | 1950-09-30 | 1951-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-31 | 1954-09-30 | 1955-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-31 | 1958-09-30 | 1959-04-01 | $7700.00 | Window Closed / Lapsed |