Patent US3557537A successfully refreshed from Google Patents.
US3663974A
Expired / Lapsed
US
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Treatment of a cross-linking agent-impregnated cellulosic fabric with a gaseous acid catalyst
Assignee: Toyobo Co Ltd
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Filing: 1968-03-06
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Granted: 1972-05-23
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Expires: 1988-03-06
Abstract
Abstract A fabric comprising cellulose or a blend thereof which may or may not be premercerized or prealkylated is impregnated with an aldehyde or an aldehyde liberating compound and thereafter exposed to acidic vapors to catalyze the reaction. Softening agents, bluing agents, formaldehyde catchers, optical brighteners, etc., may be included in the impregnating bath.
Inventors
- 👤 Kumao Watanabe
- 👤 Tooru Matumoto
- 👤 Tamio Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:44
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12; D06M13/127; D06M11/00; D06M11/07; D06M11/11; D06M11/51; D06M11/54; D06M11/55; D06M13/123
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
24 words
A process as claimed in claim 1 wherein the fabric is dried to a moisture content between 6 percent and 15 percent by weight.
Claim 2
Dependent Claim
32 words
A process as claimed in claim 1 wherein the formaldehyde or formaldehyde liberating substance is impregnated in the fabric in an amount of 4-15 percent by weight based on the fabric weight.
Claim 3
Dependent Claim
31 words
A process as claimed in claim 1 wherein the fabric to be contacted with the gaseous acidic substance also contains a softener selected from polyolefine type softeners and silicone type softeners.
Claim 4
Dependent Claim
40 words
A process as claimed in claim 1 wherein the contact of the fabric with the gaseous acidic substance is carried out by exposing the fabric to an atmosphere containing at least 1 percent by volume of the gaseous acidic substance.
Claim 5
Dependent Claim
16 words
A process as claimed in claim 1 wherein the fabric is mercerized prior to said impregnation.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 1 wherein the fabric is subjected to an alkylation or substituted-alkylation prior to said impregnation.
Claim 7
Dependent Claim
12 words
A process as claimed in claim 1 wherein the aldehyde is formaldehyde.
References Cited (Backward Citations)
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US3175874A
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |