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Patent US3236676A successfully refreshed from Google Patents.
US3236676A
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Treatment of cellulose with tetrakis (hydroxymethyl) phosphonium resins
Assignee: Solvay Solutions UK Ltd
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Filing: 1962-06-11
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Granted: 1966-02-22
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Expires: 1982-06-11
Abstract
No abstract record available.
Inventors
- 👤 Coates Harold
- 👤 Chalkley Brian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:17
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/0002; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/285; D06M15/00; D06M15/19; D06M15/37; D06M15/667; D06M15/673; D21H11/00; D21H17/00; D21H17/03; D21H17/05; D21H17/10; D21H21/00; D21H21/14; D21H21/34; B; B27; B27K; B27K2240/00; B27K2240/30; B27K3/00; B27K3/52; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A METHOD OF PRODUCING FLAME-RESISTANT CELLULOSIC MATERIALS COMPRISING TREATING CELLULOSIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF NATURAL CELLULOSE AND REGENERATED CELLULOSE WITH A COMPOSITION CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF A TETRAKIS (HYDROXYMETHYL) PHOSPHONIUM SALT HAVING A PH BETWEEN ABOUT 3 AND 9.5, DRYING SAID TREATED MATERIAL AND HEATING SAID TREATED MATERIAL TO A TEMPERATURE SUFFICIENT TO FIX SAID SALT ON SAID MATERIAL, AND THEN TREATING SAID MATERIAL WITH AMMONIA TO PRODUCE A SUBSTANTIALLY INSOLUBLE POLYMER FORMED FORM SAID SALT AND AMMONIA ON SAID CELLULOSIC MATERIAL.
Claim 2
Independent Claim
88 words
A METHOD OF PRODUCING FLAME-RESISTANT CELLULOSIC MATERIALS COMPRISING TREATING CELLULOSIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF NATURAL CELLULOSE AND REGENERATED CELLULOSE WITH A COMPOSITION CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF A TETRAKIS (HYDROXYMETHYL) PHOSPHONIUM SALT HAVING A PH BETWEEN ABOUT 3 AND 9.5, DRYING SAID TREATED MATERIAL AND HEATING SAID TREATED MATERIAL TO A TEMPERATURE SUFFICIENT TO FIX SAID SALT ON SAID MATERIAL, AND THEN TREATING SAID MATERIAL WITH AMMONIA TO PRODUCE A SUBSTANTIALLY INSOLUBLE POLYMER FORMED FORM SAID SALT AND AMMONIA ON SAID CELLULOSIC MATERIAL.
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |