US2477631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic bleaching with chlorites
Assignee: Ecusta Paper Corp
•
Filing: 1945-02-21
•
Granted: 1949-08-02
•
Expires: 1965-02-21
Abstract
No abstract record available.
Inventors
- 👤 Robert M Levy
- 👤 James E Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:05
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/12; D21C9/14; D06; D06L; D06L4/00; D06L4/20; D06L4/22; D06L4/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US321452A
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US1163438A
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GB260190A
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US1777751A
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GB311435A
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US1904190A
Cited
FR722871A
Cited
US2193173A
Cited
US2249646A
Cited
US2353823A
Cited
US2367771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-01 | 1953-01-31 | 1953-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-01 | 1957-01-31 | 1957-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-01 | 1961-01-31 | 1961-08-02 | $7700.00 | Window Closed / Lapsed |