Patent US3275402A successfully refreshed from Google Patents.
US3275402A
Expired / Lapsed
US
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Formaldehyde modification of cellulose conducted in the presence of a stiffening agent and a lewis acid metallic salt
Assignee: Akzo Nobel UK PLC
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Filing: 1961-06-02
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Granted: 1966-09-27
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Expires: 1981-06-02
Abstract
No abstract record available.
Inventors
- 👤 George C Daul
- 👤 Thomas F Drake
- 👤 Marshall W Duke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:10
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12; D06M13/127; C; C08; C08B; C08B15/00; C08B15/10; D01; D01F; D01F2/00; D01F2/06; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A METHOD FOR IMPROVING THE WET AND DRY CREASE RECOVERY PROPERTIES OF CELLULOSE FABRICS WHICH COMPRISES IMPREGNATING SAID FABRICS WITH FROMALDEHYDE, WITH AT LEAST 0.03 MOL, PER 100 G. OF CELLULOSE, OF A METALLIC SALT WHICH IS A LEWIS ACID IN THE SOLID STATE AND WHICH IS WATER SOLUBLE TO THE EXTENT OF AT LEAST 0.03 MOL/LITER AT 20*C. AND PH 5, AND A POLYMERIC FILM FORMING STIFFENING MATERIAL CAPABLE OF REACTING WITH NORMALDEHYDE, SAID IMPREGNATION WITH FORMALDEHYDE AND METALLIC SALT BEING EFFECTED IN THE PRESENCE OF WATER AT A PH OF AT LEAST 5, AND CURING THE IMPREGNATED MATERIAL TO CROSS LINK THE CELLULOSE AND TO BOND THE FILM MATERIAL TO THE CELLULOSE.
Claim 2
Independent Claim
114 words
A METHOD FOR IMPROVING THE WET AND DRY CREASE RECOVERY PROPERTIES OF CELLULOSE FABRICS WHICH COMPRISES IMPREGNATING SAID FABRICS WITH FROMALDEHYDE, WITH AT LEAST 0.03 MOL, PER 100 G. OF CELLULOSE, OF A METALLIC SALT WHICH IS A LEWIS ACID IN THE SOLID STATE AND WHICH IS WATER SOLUBLE TO THE EXTENT OF AT LEAST 0.03 MOL/LITER AT 20*C. AND PH 5, AND A POLYMERIC FILM FORMING STIFFENING MATERIAL CAPABLE OF REACTING WITH NORMALDEHYDE, SAID IMPREGNATION WITH FORMALDEHYDE AND METALLIC SALT BEING EFFECTED IN THE PRESENCE OF WATER AT A PH OF AT LEAST 5, AND CURING THE IMPREGNATED MATERIAL TO CROSS LINK THE CELLULOSE AND TO BOND THE FILM MATERIAL TO THE CELLULOSE.
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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |