US4603069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet-like article
Assignee: Lever Brothers Co
•
Filing: 1985-05-24
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Granted: 1986-07-29
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Expires: 2005-05-24
Abstract
Abstract A sheet-like article suitable, for example, for wiping hard surfaces, comprises two sheets of nonwoven fabric or the like having sandwiched betweem them a solid core material which may be a highly porous, optionally liquid-containing, polymer. The two outer sheets are bonded to each other, without involving the core material, by means of a plurality of small, spaced bonding points, for example, spot-welds. Preferably the core material is in continuous sheet form and is perforated to accommodate the bonding points.
Inventors
- 👤 Zia Haq
- 👤 Richard Harbour
- 👤 Donald Peter
- 👤 Serge A. Symien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:47
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/02; A; A45; A45D; A45D37/00; A47; A47L; A47L13/00; A47L13/10; A47L13/16; A47L13/17; B32B27/00; B32B27/06; B32B27/10; B32B3/26; B32B3/266; B32B5/00; B32B5/18; C; C11; C11D; C11D17/00; C11D17/04; C11D17/049; A45D2200/00; A45D2200/10; A45D2200/1009; A45D2200/1018; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/726; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/239; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24339; Y10T428/24802; Y10T428/24826
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
133 words
A flexible sheet-like article comprising first and second sheet substrates, at least one of which is liquid-permeable, having sandwiched between them an intermediate layer in continuous sheet form of solid core material selected from the group consisting of absorbent and active material, the first and second substrates being bonded to one another through a plurality of relatively small perforations, which perforations penetrate said intermediate layer solid core material yet without said bonding involving the intermediate layer, at a plurality of locations of relatively small area distributed relatively uniformly over the area of the article, said relatively small perforations and relatively small areas having a total area not exceeding that of the solid surface areas therebetween, and the distance between adjacent bonding locations being substantially greater than the dimensions of the bonding locations themselves.
Claim 2
Dependent Claim
133 words
A flexible sheet-like article comprising first and second sheet substrates, at least one of which is liquid-permeable, having sandwiched between them an intermediate layer in continuous sheet form of solid core material selected from the group consisting of absorbent and active material, the first and second substrates being bonded to one another through a plurality of relatively small perforations, which perforations penetrate said intermediate layer solid core material yet without said bonding involving the intermediate layer, at a plurality of locations of relatively small area distributed relatively uniformly over the area of the article, said relatively small perforations and relatively small areas having a total area not exceeding that of the solid surface areas therebetween, and the distance between adjacent bonding locations being substantially greater than the dimensions of the bonding locations themselves.
Claim 3
Dependent Claim
25 words
The article of claim 1, wherein the first and second sheet substrates consist at least partially of thermoplastic material and are bonded together by heat-sealing.
Claim 4
Dependent Claim
24 words
The article of claim 1, wherein the minimum distance between any two bonding locations is within the range of from 5 to 100 mm.
Claim 5
Dependent Claim
61 words
The article of claim 1, wherein the core material comprises a pressure-sensitive porous polymeric material capable of retaining at least 5 times its own weight, defined in terms of water, of liquid and of releasing at least some of said liquid on the application thereto of hand pressure, the porous polymeric material being dry or containing an aqueous or non-aqueous liquid.
Claim 6
Dependent Claim
28 words
The article of claim 4, wherein the porous polymeric material is capable of retaining at least 25 times its own weight of liquid, defined in terms of water.
Claim 7
Dependent Claim
25 words
The article of claim 4, wherein the porous polymeric material is the polymerisation product of a high internal phase emulsion having an aqueous internal phase.
Claim 8
Dependent Claim
32 words
The article of claim 1, wherein the core material comprises a porous material containing a liquid which constitutes at least 90% of the weight of the liquid and the porous material together.
Claim 9
Dependent Claim
27 words
The article of claim 1, wherein one or both of the first and second substrate layers comprises paper or nonwoven fabric having a coating of thermoplastic material.
Claim 10
Dependent Claim
57 words
The article of claim 1, wherein the intermediate layer of solid core material comprises solid porous material containing a homogeneous aqueous liquid composition having a surface tension of less than 45 mNm -1 , which composition, when applied to a surface and allowed to dry, dries substantially without forming discrete droplets or particles larger than 0.25 μm.
Claim 11
Dependent Claim
22 words
The article of claim 8, wherein the coating of thermoplastic material is continuous and provided with pinholes for the passage of liquid.
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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) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |