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US2590905A
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Apparatus for concentrating residual pulp liquor by direct contact with flue gases
Assignee: CANADA PAPER Co
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Filing: 1947-10-15
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Granted: 1952-04-01
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Expires: 1967-10-15
Abstract
No abstract record available.
Inventors
- 👤 George H Tomlinson
- 👤 Joseph N Swartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:47
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/10; D21C11/103; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US621718A
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US1734677A
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US2054441A
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US2056266A
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US2103521A
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US2314159A
Cited
US2396689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |