Patent US2144756A successfully refreshed from Google Patents.
US2144756A
Expired / Lapsed
US
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Process of treating wood pulp to remove pitch
Assignee: National Oil Products Co
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Filing: 1937-10-14
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Granted: 1939-01-24
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Expires: 1957-10-14
Abstract
No abstract record available.
Inventors
- 👤 James H Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:20
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/08; D21C9/086; Y; Y10; Y10S; Y10S162/00; Y10S162/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-01-23 | 1942-07-25 | 1943-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-01-23 | 1946-07-25 | 1947-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-01-23 | 1950-07-25 | 1951-01-24 | $7700.00 | Window Closed / Lapsed |