US4762637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated bleach particles for machine dishwashing compositions
Assignee: Lever Brothers Co
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Filing: 1986-11-14
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Granted: 1988-08-09
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Expires: 2006-11-14
Abstract
Abstract A particle for releasing bleach is provided combining from 50 to 99.5% of a core consisting essentially of an oxidizing material and from 0.5 to 20% of a polycarboxylate coating surrounding the core. These particles are particularly useful in automatic dishwasher powder detergent compositions.
Inventors
- 👤 Michael Aronson
- 👤 Michele R. Lock
- 👤 Edward Santos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:11
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/395; C11D3/3953; C11D17/00; C11D17/0039; C11D3/3955
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
130 words
An automatic dishwasher powder detergent comprising: (i) from 0.5 to 15% by weight of bleach particles comprising: (a) from 50 to 99.5% by weight of said particles of a core consisting essentially of an oxidizing material having at least one reactive chlorine or bromine in its molecular structure; and (b) from 0.5 to 20% by weight of said particles of a polycarboxylate coating selected from homo- and co-polymers of carboxylic acids, carboxylic anhydrides, alkyl partial esters thereof and their salt derivatives, said coating being free of soap and fatty acids, said polycarboxylate coating being water-insoluble at or below pH 7 but soluble in aqueous alkaline media at pH 10 or higher; (ii) from 5 to 70% of a detergency builder; and (iii) from 1 to 20% of a silicate salt.
Claim 2
Dependent Claim
130 words
An automatic dishwasher powder detergent comprising: (i) from 0.5 to 15% by weight of bleach particles comprising: (a) from 50 to 99.5% by weight of said particles of a core consisting essentially of an oxidizing material having at least one reactive chlorine or bromine in its molecular structure; and (b) from 0.5 to 20% by weight of said particles of a polycarboxylate coating selected from homo- and co-polymers of carboxylic acids, carboxylic anhydrides, alkyl partial esters thereof and their salt derivatives, said coating being free of soap and fatty acids, said polycarboxylate coating being water-insoluble at or below pH 7 but soluble in aqueous alkaline media at pH 10 or higher; (ii) from 5 to 70% of a detergency builder; and (iii) from 1 to 20% of a silicate salt.
Claim 3
Dependent Claim
31 words
A powder according to claim 1 further comprising from about 0.1 to 10% of a surfactant and from 0 to 60% of sodium sulfate, and from 0 to 40% sodium carbonate.
References Cited (Backward Citations)
US3122274A
Cited
US3380922A
Cited
US3691090A
Cited
US3576760A
Cited
US3666680A
Cited
US3992317A
Cited
US3908045A
Cited
US3975280A
Cited
US4136052A
Cited
US4409117A
Cited
US4421664A
Cited
US4536314A
Cited
JPS6128597A
Cited
JPS6128441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |