US3523911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating components of cellulosic material
Assignee: Individual
•
Filing: 1969-02-26
•
Granted: 1970-08-11
•
Expires: 1989-02-26
Abstract
No abstract record available.
Inventors
- 👤 Harald F Funk
- 👤 Paula M Sarten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:59
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2289917A
Cited
US2734836A
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US1249041A
Cited
US1563295A
Cited
US2681871A
Cited
US3184397A
Cited
US3251716A
Cited
US3379622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |