Patent US2249174A successfully refreshed from Google Patents.
US2249174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing white wood pulp of high solution viscosity and purity
Assignee: Brown Co
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Filing: 1936-02-10
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Granted: 1941-07-15
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Expires: 1956-02-10
Abstract
No abstract record available.
Inventors
- 👤 George A Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:57
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/12; D21C9/08; D21C9/083
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) | 1944-07-14 | 1945-01-13 | 1945-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-14 | 1949-01-13 | 1949-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-14 | 1953-01-13 | 1953-07-15 | $7700.00 | Window Closed / Lapsed |