US4363740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making controlled sudsing detergent powder
Assignee: Lever Brothers Co
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Filing: 1981-07-21
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Granted: 1982-12-14
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Expires: 2001-07-21
Abstract
Abstract A process for manufacturing a low sudsing fabric washing powder in which a mixture of a suds-suppressant, such as an alkyl phosphoric acid ester or a salt thereof, and a hydrophobic material such as a petroleum jelly or a natural or synthetic wax is combined with a spray-dried detergent powder. The temperature of the powder at which combination takes place is lower than the drop-melting point of the mixture of suds-suppressant and hydrophobic material.
Inventors
- 👤 Michael Curtis
- 👤 Peter R. Garrett
- 👤 John Mead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:08
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0026; C11D11/00; C11D11/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A process for the production of a controlled sudsing fabric washing powder having improved suds suppression effectiveness comprising the steps of: (a) heating a suds-suppressant/hydrophobic material combination to a temperature above its drop melting point; (b) combining the suds-suppressant/hydrophobic material combination heated to said temperature above its drop melting point with a spray-dried base powder maintained at a temperature below said drop melting point; and (c) cooling said suds-suppressant/hydrophobic material combination to a solid or gel.
Claim 2
Dependent Claim
76 words
A process for the production of a controlled sudsing fabric washing powder having improved suds suppression effectiveness comprising the steps of: (a) heating a suds-suppressant/hydrophobic material combination to a temperature above its drop melting point; (b) combining the suds-suppressant/hydrophobic material combination heated to said temperature above its drop melting point with a spray-dried base powder maintained at a temperature below said drop melting point; and (c) cooling said suds-suppressant/hydrophobic material combination to a solid or gel.
Claim 3
Dependent Claim
43 words
A process for the production of a controlled sudsing fabric washing powder according to claim 1 wherein the spray-dried powder is maintained at least 15° C. below the drop melting point of the suds-suppressant/hydrophobic material combination and said combination cools to a gel.
Claim 4
Dependent Claim
36 words
A process for the production of a controlled sudsing fabric washing powder according to claim 1 or 2 wherein the suds suppressant/hydrophobic material combination is sprayed in liquid or molten form onto the spray-dried base powder.
Claim 5
Dependent Claim
39 words
A process for the production of a controlled sudsing fabric washing powder according to claim 1 or 2 wherein the base powder is admixed with sodium perborate or sodium percarbonate prior to combining with the suds suppressant/hydrophobic material combination.
Claim 6
Dependent Claim
34 words
A process for the production of a controlled sudsing fabric washing powder according to claim 1 or 2 wherein the suds suppressant comprises an alkyl phosphoric acid or a water-soluble or water-insoluble salt thereof.
Claim 7
Dependent Claim
28 words
A process for the production of a controlled sudsing fabric washing powder according to claim 1 wherein the hydrophobic material comprises a wax which cools to a solid.
Claim 8
Dependent Claim
28 words
A process for the production of a controlled sudsing fabric washing powder according to claim 2 wherein the hydrophobic material comprises petroleum jelly which cools to a gel.
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) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |