Patent US3798057A successfully refreshed from Google Patents.
US3798057A
Expired / Lapsed
US
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Impregnated fibrous web structures
Assignee: Carl Munters AB
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Filing: 1971-10-05
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Granted: 1974-03-19
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Expires: 1991-10-05
Abstract
Abstract Fibrous webs, such as asbestos paper, are impregnated with a mixture of a chlorinated polymeric C3 or C5 hydrocarbon, a chlorinated terphenyl or chlorinated paraffin plasticizer, and a polyepoxy compound. The impregnated webs, when suitably shaped, are useful as contact tower air and water contact bodies.
Inventors
- 👤 W Polovina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:22
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B01; B01J; B01J19/00; B01J19/32; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/26; C03C25/27; C03C25/465; C03C25/47; C04B41/45; C04B41/46; C04B41/48; C04B41/4838; D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/587; D04H1/64; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/227; D06M15/37; D06M15/55; D21; D21H; D21H17/00; D21H17/71; D21H17/74; D21H21/00; D21H21/14; D21H21/34; D21H5/00; D21H5/0002; F; F28; F28F; F28F25/00; F28F25/02; F28F25/08; F28F25/087; B01J2219/00; B01J2219/32; B01J2219/322; B01J2219/32203; B01J2219/3221; B01J2219/32213; B01J2219/3222; B01J2219/32224; B01J2219/32227; B01J2219/324; B01J2219/32425; B01J2219/32441; B01J2219/32483; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
34 words
An impregnated fibrous web as in claim 1 wherein said impregnating mixture additionally contains up to 2 percent of carbon black and up to 50 percent of mineral fillers, by weight of said polymer.
Claim 2
Dependent Claim
23 words
An impregnated fibrous web as in claim 1 wherein said polymer is a chlorinated rubber comprising about 65 percent by weight of chlorine.
Claim 3
Dependent Claim
19 words
An impregnated fibrous web as in claim 1 wherein said polyglycidyl ether is a polyglycidyl ether of a bisphenol.
Claim 4
Dependent Claim
129 words
A shaped, acid-, alkali-, and water-resistant, non-flammable sheet, adaptable to use in forming contact tower air and water contact bodies, comprising a non-flammable web of mineral fibers impregnated with from 10 to 30 percent, by weight of the impregnated web, of a mixture comprising: (1) a chlorinated rubber or chlorinated polypropylene comprising about 65 percent by weight of chlorine; (2) about 5 to about 50 percent, by weight of said chlorinated rubber or chlorinated polypropylene, of a chlorinated terphenyl or chlorinated paraffin comprising about 40 to 70 percent by weight of chlorine; and (3) about 0.5 to about 10 percent, by weight of said chlorinated rubber or chlorinated polypropylene, of a polyglycidyl ether of a bisphenol, said fibrous web having been rigidified by said polyglycidyl ether of a bisphenol.
Claim 5
Dependent Claim
32 words
A shaped sheet as in claim 5 wherein said impregnating mixture additionally contains from 0 - 2 percent, by weight of said chlorinated rubber or chlorinated polypropylene, of finely divided carbon black.
Claim 6
Dependent Claim
16 words
A shaped sheet as in claim 6 which is a corrugated impregnated web of asbestos paper.
Claim 7
Independent Claim
154 words
The method of making an acid-, alkali-, and water-resistant, flame-resistant sheet, adaptable to use in forming contact tower air and water contact bodies, which method comprises impregnating a fibrous web by contacting said web with a solution, in a volatile organic solvent, of a mixture comprising: (1) a chlorinated rubber or chlorinated polypropylene comprising about 65 percent by weight of chlorine; (2) about 5 to about 50 percent, by weight of said chlorinated rubber or chlorinated polypropylene, of a chlorinated terphenyl or chlorinated paraffin comprising about 40 to 70 percent by weight of chlorine; and (3) about 0.5 to about 10 percent, by weight of said chlorinated rubber or chlorinated polypropylene, of a polyglycidyl ether of a bisphenol present as a rigidifying agent for the impregnated web; and then removing said solvent from said web to leave from 10 to 30 percent, by weight of the impregnated web, of said mixture in said web.
Claim 8
Dependent Claim
13 words
The method as in claim 8 wherein said fibrous web comprises mineral fibers.
Claim 9
Dependent Claim
22 words
The method as in claim 8 wherein said fibrous web is formed into a shaped sheet immediately after impregnation with said solution.
Claim 10
Dependent Claim
41 words
The method as in claim 8 wherein only a portion of said solvent is removed from said web after impregnation, the partially dried web is then formed into a shaped sheet, and the remaining solvent is then removed from said web.
Claim 11
Dependent Claim
34 words
The method as in claim 8 wherein the dried impregnated web is remoistened with solvent to soften it, formed into a shaped sheet while soft, and then re-dried after shaping by removing said solvent.
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |