US2418211A
Expired / Lapsed
US
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Method of making cellular cellulose derivatives
Assignee: Acordis UK Ltd
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Filing: 1943-12-09
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Granted: 1947-04-01
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Expires: 1963-12-09
Abstract
No abstract record available.
Inventors
- 👤 Williams John Guilfoyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:25
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J2201/00; C08J2201/04; C08J2201/05; C08J2201/0502; C08J2201/054; C08J2201/0542; C08J2201/0543; C08J2201/0545; C08J2201/0546; C08J2301/00; C08J2301/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1906041A
Cited
GB365526A
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US2027688A
Cited
US1991115A
Cited
US2319052A
Cited
US2319054A
Cited
GB528375A
Cited
US2319051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-31 | 1950-09-30 | 1951-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-31 | 1954-09-30 | 1955-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-31 | 1958-09-30 | 1959-04-01 | $7700.00 | Window Closed / Lapsed |