US2821489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discoloration-resistant regenerated cellulose articles
Assignee: Akzo Nobel UK PLC
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Filing: 1955-03-28
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Granted: 1958-01-28
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Expires: 1975-03-28
Abstract
No abstract record available.
Inventors
- 👤 Rembert D Mcneer
- 👤 Alfred W Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:53
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/10; D01; D01F; D01F2/00; D01F2/06; D06M; D06M11/00; D06M11/07; D06M11/11; D06M11/13; D06M11/155; D06M11/51; D06M11/54; D06M11/55; D06M11/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
PROCESS FOR MANUFACTURING DISCOLORATION-RESISTANT CELLULOSIC ARTICLES COMPRISING WASHING A PRESHAPED REGENERATED CELLULOSE ARTICLE FREE OF SOLUBLE IMPURITIES, SATURATING THE ARTICLE WITH A SOLUTION HAVING A PH IN THE RANGE OF 3 TO 6 AND CONTAINING HYDROGEN SULFITE IONS AND THEN IONS. DRYING THE ARTICLE IN THE PRESENCE OF THE HYDROGEN SULFITE
Claim 2
Dependent Claim
51 words
PROCESS FOR MANUFACTURING DISCOLORATION-RESISTANT CELLULOSIC ARTICLES COMPRISING WASHING A PRESHAPED REGENERATED CELLULOSE ARTICLE FREE OF SOLUBLE IMPURITIES, SATURATING THE ARTICLE WITH A SOLUTION HAVING A PH IN THE RANGE OF 3 TO 6 AND CONTAINING HYDROGEN SULFITE IONS AND THEN IONS. DRYING THE ARTICLE IN THE PRESENCE OF THE HYDROGEN SULFITE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |