Patent US2805169A successfully refreshed from Google Patents.
US2805169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-alpha cellulose
Assignee: Rayonier Inc
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Filing: 1955-07-18
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Granted: 1957-09-03
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Expires: 1975-07-18
Abstract
No abstract record available.
Inventors
- 👤 Mitchell Reid Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:32
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
AN IMPROVED HIGH-ALPHA CELLULOSE DISSOLVING WOOD PULP SUITABLE FOR CONVERSION INTO CELLULOSIC SOLUTIONS WHICH PULP CONTAINS RESIDUAL ETHER EXTRACTABLE RESINS OF THE WOOD, AND FROM ABOUT 0.02% TO ABOUT 0.5% BASED ON THE BONE DRY WEIGHT OF THE PULP OF AN ADDED WATERSOLUBLE NON-IONIC COMPOUND REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
49 words
AN IMPROVED HIGH-ALPHA CELLULOSE DISSOLVING WOOD PULP SUITABLE FOR CONVERSION INTO CELLULOSIC SOLUTIONS WHICH PULP CONTAINS RESIDUAL ETHER EXTRACTABLE RESINS OF THE WOOD, AND FROM ABOUT 0.02% TO ABOUT 0.5% BASED ON THE BONE DRY WEIGHT OF THE PULP OF AN ADDED WATERSOLUBLE NON-IONIC COMPOUND REPRESENTED BY THE FORMULA:
References Cited (Backward Citations)
US2359750A
Cited
US2362217A
Cited
US2481692A
Cited
US2425845A
Cited
US2481278A
Cited
US2674619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |