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Patent US2345333A successfully refreshed from Google Patents.
US2345333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of solutions of cellulose in sulphuric acid
Assignee: Individual
•
Filing: 1940-07-10
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Granted: 1944-03-28
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Expires: 1960-07-10
Abstract
No abstract record available.
Inventors
- 👤 Fink Heinrich
- 👤 Hofstadt Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:52
CPC Classifications
C; C08; C08B; C08B1/00; C08B1/003; D; D01; D01F; D01F2/00; D01F2/02
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) | 1947-03-28 | 1947-09-27 | 1948-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-03-28 | 1951-09-27 | 1952-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-03-28 | 1955-09-27 | 1956-03-28 | $7700.00 | Window Closed / Lapsed |