US4130392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching process
Assignee: Procter and Gamble Co
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Filing: 1975-11-10
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Granted: 1978-12-19
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Expires: 1995-11-10
Abstract
Abstract Contacting damp fabrics with a dry, activated bleaching composition in an automatic dryer results in improved bleaching and stain removal over dry bleaching compositions employed in an aqueous laundering bath.
Inventors
- 👤 Francis L. Diehl
- 👤 James B. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:26
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/04; C11D17/041; C11D17/047; C11D3/00; C11D3/39; C11D3/3902; C11D3/3905; D; D06; D06L; D06L4/00; D06L4/10; D06L4/12; C11D2111/00; C11D2111/10; C11D2111/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
A process for removing stains from fabrics in an automatic clothes dryer during the drying cycle comprising the steps of: (1) tumbling damp fabrics at a temperature of from 50° C. to 80° C. in the clothes dryer; and (2) uniformly distributing an effective amount of a solid particulate bleaching composition consisting essentially of a peroxygen bleach having an average particle diameter below about 200 microns onto the damp fabrics within the first 10 minutes to 15 minutes of the drying cycle such that the bleaching composition is able to act in the presence of water on the damp fabrics prior to evaporation of the water from the fabrics.
Claim 2
Dependent Claim
109 words
A process for removing stains from fabrics in an automatic clothes dryer during the drying cycle comprising the steps of: (1) tumbling damp fabrics at a temperature of from 50° C. to 80° C. in the clothes dryer; and (2) uniformly distributing an effective amount of a solid particulate bleaching composition consisting essentially of a peroxygen bleach having an average particle diameter below about 200 microns onto the damp fabrics within the first 10 minutes to 15 minutes of the drying cycle such that the bleaching composition is able to act in the presence of water on the damp fabrics prior to evaporation of the water from the fabrics.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein the bleaching composition consists essentially of a peroxygen bleach and a peroxygen bleach activator.
Claim 4
Dependent Claim
33 words
A process according to claim 2 wherein the bleaching composition consists essentially of a bleach selected from the group consisting of alkali metal perborates and ammonium perborate, and the activator is 1,3,4,6-tetra-acetyl glycouril.
Claim 5
Dependent Claim
23 words
A process according to claim 3 wherein the weight ratio of perborate:1,3,4,6-tetra-acetyl glycouril is in the range of from 1:3 to about 30:1.
Claim 6
Dependent Claim
38 words
A process according to claim 1 wherein the bleaching composition comprises from about 1 part to about 10 parts by weight of sodium perborate and from about 2 parts to about 1 part by weight of 1,3,4,6-tetra-acetyl glycouril.
Claim 7
Dependent Claim
21 words
A process according to claim 1 wherein the bleaching composition is evenly distributed on the damp fabrics by a dispensing means.
Claim 8
Dependent Claim
17 words
A process according to claim 6 wherein the dispensing means comprises a water-insoluble, closed, flexible, porous pouch.
Claim 9
Dependent Claim
24 words
A process according to claim 1 wherein the bleaching composition has an average particle diameter of from about 25 microns to about 175 microns.
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) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |