US4515703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Article carrying active material
Assignee: Lever Brothers Co
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Filing: 1982-05-27
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Granted: 1985-05-07
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Expires: 2002-05-27
Abstract
Abstract An article for wiping surfaces or for releasing an active material has a "closed sandwich" structure comprising two substrate layers bonded together in such a way as to create a plurality of compartments, at least some of the compartments containing active material, for example, a soap or detergent or bubble bath composition, at least some of the compartments being provided with one or more perforations in one or both walls for release of the active material. Advantageously, different compartments have different numbers of perforations, to allow the active material to be released in a controlled manner over a relatively long period of time. The substrates advantageously comprise paper or nonwoven fabric laminated with thermoplastic film, the two substrate layers being bonded together in a grid pattern by heat-sealing of the thermoplastic films.
Inventors
- 👤 Zia Haq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:18
CPC Classifications
A; A47; A47L; A47L13/00; A47L13/10; A47L13/16; A47L13/17; C; C11; C11D; C11D17/00; C11D17/04; C11D17/049
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
138 words
An article in the form of a substrate carrying a releasable active material, said article comprising first and second substrates each comprising an outer layer of a paper or nonwoven fabric completely surrounding and having laminated thereto or coated thereon an inner layer of active liquid-impermeable thermoplastic material, said inner layers being so bonded together as to create a plurality of compartments therebetween, at least some of said compartments containing said releasable active material and each of said compartments carrying active material being provided with one or more perforations having diameters within the range of from 0.2 to 1.2 mm in one or each of the substrate walls defining said compartments, the distribution of perforations being within the range of from 0.5 to 3/cm 2 , said perforations providing the means for release of said releasable active material.
Claim 2
Dependent Claim
138 words
An article in the form of a substrate carrying a releasable active material, said article comprising first and second substrates each comprising an outer layer of a paper or nonwoven fabric completely surrounding and having laminated thereto or coated thereon an inner layer of active liquid-impermeable thermoplastic material, said inner layers being so bonded together as to create a plurality of compartments therebetween, at least some of said compartments containing said releasable active material and each of said compartments carrying active material being provided with one or more perforations having diameters within the range of from 0.2 to 1.2 mm in one or each of the substrate walls defining said compartments, the distribution of perforations being within the range of from 0.5 to 3/cm 2 , said perforations providing the means for release of said releasable active material.
Claim 3
Dependent Claim
15 words
The article of claim 1, wherein different compartments are provided with different numbers of perforations.
Claim 4
Dependent Claim
12 words
The article of claim 1, wherein different compartments contain different active materials.
Claim 5
Dependent Claim
36 words
The article of claim 1, wherein it contains a liquid active material that is prevented from escaping unless either pressure is applied or is dipped in a liquid which dissolves or disperses out the active material.
Claim 6
Dependent Claim
14 words
The article of claim 1, wherein it includes as active material a detergent composition.
Claim 7
Dependent Claim
17 words
The article of claim 1, wherein the first and second substrate layers are of flexible sheet material.
Claim 8
Dependent Claim
20 words
The article of claim 1, wherein the compartments have area within the range of from 0.5 to 5/cm 2 .
Claim 9
Dependent Claim
12 words
The article of claim 1, wherein the compartments are of parallelogram shapes.
Claim 10
Dependent Claim
21 words
The article of claim 1, wherein one or each substrate layer carries a layer of abrasive material on its outer surface.
Claim 11
Dependent Claim
16 words
The article of claim 1, wherein said substrates are bonded together by heat-sealing or ultrasonic sealing.
Claim 12
Dependent Claim
25 words
The article of claim 9, wherein the abrasive comprises a particulate material having a particle size within the range of from 10 to 150 μm.
Claim 13
Dependent Claim
14 words
The article of claim 9, wherein the abrasive material is a synthetic polymeric material.
Claim 14
Dependent Claim
22 words
The article of claim 9, wherein the abrasive material is selected from the group consisting of polystyrene, polyvinyl chloride, and polymethyl methacrylate.
Claim 15
Dependent Claim
19 words
The article of claim 9, wherein the abrasive material is held on the substrate layer(s) by a thermoplastic adhesive.
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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) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |