US4874536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic surfactant cakes with magnesium chloride
Assignee: Procter and Gamble Co
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Filing: 1984-06-29
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Granted: 1989-10-17
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Expires: 2004-06-29
Abstract
Abstract A solid water-soluble cake comprising: from 20% to 90% sodium alkyl sulfate (AS)/sodium alkyl benzene sulfonate (LAS), co-surfactant having a 1:1.5 to 1.5:1 ratio and from 0.5% to 25% by weight magnesium chloride. One key advantage is that the cakes of this invention have a more constant dissolution rate over a wider range of water temperatures than comparable cakes made without the MgCl2. The cakes are used in automatic toilet bowl cleanser dispensers.
Inventors
- 👤 Wilbur C. Strickland, Jr.
- 👤 Rosstain F. Sterling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:30
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/046; C11D1/00; C11D1/02; C11D1/37; C11D17/00; C11D17/0047; C11D17/0056; C11D1/12; C11D1/14; C11D1/22
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
53 words
A solid water-soluble toilet bowl cleaning cake consisting essentially of from 20% to 90% C 9 -C 15 alkyl sulfate C 9 -C 15 alkyl benzene sulfonate co-surfactant having a 1:1.5 to 1.5:1 ratio and from 0.5% to 25% weight magnesium chloride wherein said cake is present in a dosing toilet bowl dispenser.
Claim 2
Dependent Claim
53 words
A solid water-soluble toilet bowl cleaning cake consisting essentially of from 20% to 90% C 9 -C 15 alkyl sulfate C 9 -C 15 alkyl benzene sulfonate co-surfactant having a 1:1.5 to 1.5:1 ratio and from 0.5% to 25% weight magnesium chloride wherein said cake is present in a dosing toilet bowl dispenser.
Claim 3
Dependent Claim
31 words
The invention of claim 1 wherein said cake comprises a blend of magnesium chloride and sodium chloride present at a level of from 0.5% to 40% by weight of said cake.
Claim 4
Dependent Claim
31 words
The invention of claim 2 wherein said blend is present at a level of from 20% to 35% and the ratio of sodium chloride to magnesium chloride is 5:1 to 20:1.
Claim 5
Dependent Claim
15 words
The invention of claim 3 wherein the ratio of said blend is 10:1 to 14:1.
Claim 6
Dependent Claim
20 words
The invention of claim 1 wherein said cake contains from 5% to 20% perfume and from 0% to 12% dye.
Claim 7
Dependent Claim
20 words
The cake of claim 5 wherein said cake contains from 9% to 20% perfume and from 0.5% to 2.0% dye.
Claim 8
Dependent Claim
20 words
The cake of claim 5 wherein said cake contains from 9% to 20% perfume and from 1.0% to 5.0% dye.
Claim 9
Dependent Claim
12 words
The cake of claim 1 wherein said cake also contains a buffer.
Claim 10
Dependent Claim
21 words
The invention of claim 1 wherein said alkyl sulfate and alkylbenzene sulfonate have a weight ratio of from 0.8:1 to 1:0.8.
Claim 11
Dependent Claim
12 words
The invention of claim 1 wherein said co-surfactant ratio is about 1:1.
Claim 12
Dependent Claim
12 words
The invention of claim 1 wherein said alkyl groups are both lauryl.
Claim 13
Independent Claim
75 words
A method of improving the longevity of a solid water-soluble toilet bowl cleaning cake which is made from a mix containing from 20% to 90% C 9 -C 15 alkyl sulfate flakes/C 9 -C 15 alkyl benzene sulfonate co-surfactant flakes having a 1:1.5 to 1.5:1 ratio, the improvement consisting essentially of adding to said co-surfactant mix from 0.5% to 25% by weight magnesium chloride wherein said cake is present in a dosing toilet bowl dispenser.
Claim 14
Independent Claim
75 words
A method of improving the longevity of a solid water-soluble toilet bowl cleaning cake which is made from a mix containing from 20% to 90% C 9 -C 15 alkyl sulfate flakes/C 9 -C 15 alkyl benzene sulfonate co-surfactant flakes having a 1:1.5 to 1.5:1 ratio, the improvement consisting essentially of adding to said co-surfactant mix from 0.5% to 25% by weight magnesium chloride wherein said cake is present in a dosing toilet bowl dispenser.
References Cited (Backward Citations)
US2372838A
Cited
US2781320A
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US1748533A
Cited
US2781321A
Cited
US4278571A
Cited
US4310434A
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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) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |