Patent US2028762A successfully refreshed from Google Patents.
US2028762A
Expired / Lapsed
US
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Method of reducing the viscosity of cellulose esters of organic acids
Assignee: Celanese Corp
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Filing: 1930-07-08
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Granted: 1936-01-28
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Expires: 1950-07-08
Abstract
No abstract record available.
Inventors
- 👤 Dreyfus Camille
- 👤 Schneider George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:48
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/22; C08B3/24
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 |