Patent US2028846A successfully refreshed from Google Patents.
US2028846A
Expired / Lapsed
US
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Cellulose pulp for esterification purposes and processing of same
Assignee: Brown Co
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Filing: 1931-06-22
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Granted: 1936-01-28
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Expires: 1951-06-22
Abstract
No abstract record available.
Inventors
- 👤 George A Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:07
CPC Classifications
C; C08; C08B; C08B1/00; C08B1/02
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) | 1939-01-27 | 1939-07-29 | 1940-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-01-27 | 1943-07-29 | 1944-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-01-27 | 1947-07-29 | 1948-01-28 | $7700.00 | Window Closed / Lapsed |