US4011172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching articles
Assignee: Procter and Gamble Co
•
Filing: 1975-03-27
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Granted: 1977-03-08
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Expires: 1995-03-27
Abstract
Abstract Thickened chlorine bleaches, and articles releasably containing same, especially adapted for use in an automatic dryer are provided.
Inventors
- 👤 Mario Stephen Marsan
- 👤 Francis Louvaine Diehl
- 👤 James Byrd Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:37
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/20; D06L4/21; D06L4/22; D06L4/23; Y; Y10; Y10S; Y10S428/00; Y10S428/905; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
140 words
An article especially adapted for bleaching fabrics in an automatic clothes dryer, comprising: a. a thickened chlorine bleaching composition characterized by a viscosity in the range from 200 cps to 100,000 cps wherein the composition has an available chlorine content of from about 0.5% to about 15% by weight and a pH of from 8 to 11 and wherein the composition is thickened with a thickener selected from the group consisting of colloidal silicas, water-swellable and water-soluble polyacrylamides, cellulose derivatives, clays, and mixtures thereof; and b. a water-insoluble dispensing means holding the bleaching composition characterized by being in the form of a pouch having perforations of a diameter from about 0.05 mm to about 3 mm or embossed in such a manner that upon rupture perforations are formed having a diameter of from about 0.05 mm to about 3 mm.
Claim 2
Dependent Claim
140 words
An article especially adapted for bleaching fabrics in an automatic clothes dryer, comprising: a. a thickened chlorine bleaching composition characterized by a viscosity in the range from 200 cps to 100,000 cps wherein the composition has an available chlorine content of from about 0.5% to about 15% by weight and a pH of from 8 to 11 and wherein the composition is thickened with a thickener selected from the group consisting of colloidal silicas, water-swellable and water-soluble polyacrylamides, cellulose derivatives, clays, and mixtures thereof; and b. a water-insoluble dispensing means holding the bleaching composition characterized by being in the form of a pouch having perforations of a diameter from about 0.05 mm to about 3 mm or embossed in such a manner that upon rupture perforations are formed having a diameter of from about 0.05 mm to about 3 mm.
Claim 3
Dependent Claim
62 words
An article according to claim 1 wherein the bleaching composition comprises: a. an aqueous solution of chlorine; and b. from about 0.5% to about 10% by weight of a thickener selected from the group consisting of impalpable hydrophilic clays characterized in being a tri-layered mineral having an octahedral magnesia sheet between two tetrahedral silica sheets via shared oxygen atoms and smectite clays.
Claim 4
Dependent Claim
22 words
An article according to claim 2 wherein the clay is characterized by an average particle size in the range below about 50μ.
Claim 5
Dependent Claim
125 words
An article according to claim 2 especially adapted to providing controlled release of the fabric bleach in the automatic clothes dryer, comprising: a. an effective amount of a chlorine bleaching composition having a viscosity in the range of 1000 cps to 20,000 cps, comprising: i. an aqueous solution having an available chlorine content of from about 2% to about 10% by weight; and ii. wherein the hydrophilic or smectite clay has a particle size below about 50μ; and b. wherein the water-insoluble pouch is embossed in a regular pattern to the point of rupture, whereby, on rupture, at least 30% of the total surface area of the pouch is comprised of holes having an average diameter of from about 0.5 mm to about 1 mm.
References Cited (Backward Citations)
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Cited
US3708260A
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US3684722A
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US3726967A
Cited
US3789002A
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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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |