Patent US2489069A successfully refreshed from Google Patents.
US3069784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of wood pulp
Assignee: Akzo Nobel UK PLC
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Filing: 1959-04-23
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Granted: 1962-12-25
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Expires: 1979-04-23
Abstract
No abstract record available.
Inventors
- 👤 Aldred Fred Crowther
- 👤 Grew John Ernest
- 👤 Townsend Bruce Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:43
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/22; D; D21; D21C; D21C9/00; D21C9/18; D21C9/185; F; F26; F26B; F26B1/00; F26B1/005; F26B17/00; F26B17/10; F26B17/101; F26B17/103; F26B17/106
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1751552A
Cited
US1917467A
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US2075506A
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US2380214A
Cited
US2565420A
Cited
US2818917A
Cited
US2699898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |