Patent US4921743A successfully refreshed from Google Patents.
US4921743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of sorbent sheet materials as evaporative coolants
Assignee: 3M Co
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Filing: 1989-07-31
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Granted: 1990-05-01
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Expires: 2009-07-31
Abstract
Abstract A method of evaporative cooling using sorbent sheet materials comprising a fibrous web that includes entangled fibers and a solid high sorbency liquid-sorbent polymeric material is disclosed. A sorbent sheet material useful for administering cold water therapy is also described.
Inventors
- 👤 Paul E. Hansen
- 👤 Thomas I. Insley
- 👤 Christopher J. Libbey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:38
CPC Classifications
A; A61; A61F; A61F7/00; A61F7/10; A61F13/00; A61F13/01; A61F13/01008; D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/56; A61F2007/0001; A61F2007/0059; A61F2007/0063; A61F2007/0064; A61F2007/0065; A61F2007/0098; A61F7/02; A61F2007/0203; A61F2007/0206; A61F2007/0209; A61F2007/0214; A61F2007/0225; A61F2007/0228; A61F2007/0231; A61F2007/0244; A61F2007/026; A61F2013/00089; A61F2013/00187; A61F2013/00191; A61F2013/00361; A61F2013/00727; A61F2013/00731; A61F2013/00744; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24033; Y10T428/25; Y10T428/254
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
114 words
A reusable, sorbent sheet material for providing evaporative cooling, comprising (a) a sheet comprising a web comprising fibers having an average diameter of about 1-20 microns with a solid high-sorbency liquid-sorbent polymeric material contained within said web; and (b) a water and water-vapor permeable cover sheet on each of the two exposed surfaces of said web, said cover sheets being through-bonded together through said web in an intermittent pattern over substantially the entire area of said sorbent sheet material and functioning to substantially prevent migration of said polymer from said web of said sorbent sheet material when said sorbent sheet material is wetted with a volatile liquid for which said polymeric material exhibits high-sorbency.
Claim 2
Dependent Claim
114 words
A reusable, sorbent sheet material for providing evaporative cooling, comprising (a) a sheet comprising a web comprising fibers having an average diameter of about 1-20 microns with a solid high-sorbency liquid-sorbent polymeric material contained within said web; and (b) a water and water-vapor permeable cover sheet on each of the two exposed surfaces of said web, said cover sheets being through-bonded together through said web in an intermittent pattern over substantially the entire area of said sorbent sheet material and functioning to substantially prevent migration of said polymer from said web of said sorbent sheet material when said sorbent sheet material is wetted with a volatile liquid for which said polymeric material exhibits high-sorbency.
Claim 3
Dependent Claim
25 words
A sorbent sheet material according to claim 1, wherein said polymeric material is in the form of particles which are uniformly dispersed within said web.
Claim 4
Dependent Claim
18 words
A sorbent sheet material according to claim 1 wherein said polymeric material is in the form of fibers.
Claim 5
Dependent Claim
14 words
A sorbent sheet material according to claim 1, wherein said fibers are blown fibers.
Claim 6
Dependent Claim
15 words
A sorbent sheet material according to claim 4, wherein said fibers are melt blown fibers.
Claim 7
Dependent Claim
22 words
A sorbent sheet material according to claim 4, wherein said sorbent sheet material further comprises staple fibers intermingled with said blown fibers.
Claim 8
Dependent Claim
29 words
A sorbent sheet material according to claim 6, wherein said staple fibers are present in an amount of aboiut 25 to 100 percent by weight of said blown fibers.
Claim 9
Dependent Claim
28 words
A sorbent sheet material according to claim 1, wherein said polymeric material is present in an amount of about 1 to 50 percent by weight of said fibers.
Claim 10
Dependent Claim
28 words
A sorbent sheet material according to claim 1, wherein said polymeric material is present in an amount of about 5 to 30 percent by weight of said fibers.
Claim 11
Dependent Claim
31 words
A sorbent sheet material according to claim 9, wherein the amount of said polymeric material present is insufficient to allow gel-blocking of said sorbent sheet material when wetted with said liquid.
Claim 12
Dependent Claim
21 words
A sorbent sheet material according to claim 1, wherein said fibers comprise microfibers averaging less than about 10 microns in diameter.
Claim 13
Dependent Claim
20 words
A sorbent sheet material according to claim 1, wherein said sorbent sheet material further comprises surfactant dispersed within said web.
Claim 14
Dependent Claim
16 words
A sorbent sheet material according to claim 6, wherein said staple fiber is a transport fiber.
Claim 15
Dependent Claim
17 words
A sorbent sheet material according to claim 6, wherein said staple fiber is a crimped bulking fiber.
Claim 16
Dependent Claim
28 words
A sorbent sheet material according to claim 1, wherein said web comprises microfiber microwebs incorporated into a non-woven web of blown microfibers, said microwebs containing said polymeric material.
Claim 17
Dependent Claim
16 words
A sorbent sheet material according to claim 1, wherein said polymeric material exhibits high-sorbency to water.
Claim 18
Dependent Claim
16 words
A sorbent sheet material according to claim 1, wherein said cover sheets are through-bonded by stitch-bonding.
Claim 19
Dependent Claim
33 words
A sorbent sheet material according to claim 1, further comprising a mechanical fastener to attach said sorbent sheet material to the limb of a mammal to be treated with said sorbent sheet material.
Claim 20
Dependent Claim
14 words
A sorbent sheet material according to claim 1, in the form of a bandage.
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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |