US4738728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lavatory cleansing blocks containing polyvalent metal salts to control in-use block life
Assignee: JEYES HOLDINGS Ltd
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Filing: 1985-12-02
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Granted: 1988-04-19
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Expires: 2005-12-02
Abstract
Abstract A lavatory cleansing block is formed of a mixture comprising: (a) from 5 to 85% by weight of one or more anionic surface active agents; (b) from 2 to 50% by weight of one or more solubility control agents having a solubility in water less than that of the anionic surface active agent(s); and (c) from 0.5 to 50% by weight of one or more water-soluble salts of polyvalent metals.
Inventors
- 👤 Eric D. Barford
- 👤 Peter J. Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:21
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/046; C11D17/00; C11D17/0047; C11D17/0056; C11D1/00; C11D1/02; C11D1/12; C11D1/14; C11D1/143; C11D1/146; C11D1/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
A method of cleansing a lavatory which comprises immersing in the cistern of the lavatory a free standing block formed of a composition comprising: (a) from 5 to 85% by weight of at least one alkali metal anionic surface active agent; (b) from 2 to 50% by weight of at least one organic solubility control agent having a solubility in water less than that of the alkali metal anionic surface active agent; and (c) from 0.5 to 50% by weight of at least one inorganic water-soluble salt of calcium and magnesium; together with a balance, if any, of the following components: inert fillers, water-softening agents, coloring agents, perfumes, germicides and lime scale-removing agents.
Claim 2
Independent Claim
113 words
A method of cleansing a lavatory which comprises immersing in the cistern of the lavatory a free standing block formed of a composition comprising: (a) from 5 to 85% by weight of at least one alkali metal anionic surface active agent; (b) from 2 to 50% by weight of at least one organic solubility control agent having a solubility in water less than that of the alkali metal anionic surface active agent; and (c) from 0.5 to 50% by weight of at least one inorganic water-soluble salt of calcium and magnesium; together with a balance, if any, of the following components: inert fillers, water-softening agents, coloring agents, perfumes, germicides and lime scale-removing agents.
Claim 3
Dependent Claim
35 words
The method of claim 1 in which the alkali metal anionic surface active agent is selected from the group consisting of alkali metal paraffin sulphonates, alkali metal alkyl sulphates and alkali metal alkyl aryl suphonates.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein (a) contains from 15 to 60% by weight of alkali metal anionic surface active agent(s).
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein (a) also contains from 1 to 25% of a nonionic surface active agent.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein (b) contains from 2 to 30% by weight of an organic solubility control agent.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein (c) contains from 5 to 25% by weight of said inorganic water-soluble salt.
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) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |