US4931203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making an automatic dishwashing detergent powder by spraying drying and post-adding nonionic detergent
Assignee: Colgate Palmolive Co
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Filing: 1989-03-27
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Granted: 1990-06-05
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Expires: 2009-03-27
Abstract
Abstract A free flowing, stable, water-soluble, powdered automatic dishwashing detergent with superior solubility, handling and storage characteristics is provided. The compositions comprises an inorganic polyphosphate carrier onto which is absorbed a nonionic detergent. The "loaded" carrier is mixed with powdered silicate and the other usual adjuvants such as bleach, pigment, etc. High levels of detergent are possible without adversely affecting the aforementioned advantages and superior characteristics.
Inventors
- 👤 Fahim U. Ahmed
- 👤 Charles E. Buck
- 👤 Michael A. Camara
- 👤 James F. Cush, Jr.
- 👤 James A. Kaeser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:12
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/08; C11D1/00; C11D1/66; C11D1/72; C11D11/00; C11D11/0082; C11D11/0088; C11D3/06; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3761
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A method for making a free-flowing automatic dishwashing composition comprising preparing an aqueous slurry of water-soluble inorganic phosphate and a minor amount of a water-soluble polymer, spray drying said slurry to form essentially hollow beads, absorbing thereon from 2% to 40% by weight based on the weight of the beads of a non-ionic surfactant having a melting point below about 150° C. by spraying said non-ionic in liquefied form onto said beads and thereafter dry mixing said beads with powdered sodium silicate in an amount of 2% to 40% by weight.
Claim 2
Independent Claim
91 words
A method for making a free-flowing automatic dishwashing composition comprising preparing an aqueous slurry of water-soluble inorganic phosphate and a minor amount of a water-soluble polymer, spray drying said slurry to form essentially hollow beads, absorbing thereon from 2% to 40% by weight based on the weight of the beads of a non-ionic surfactant having a melting point below about 150° C. by spraying said non-ionic in liquefied form onto said beads and thereafter dry mixing said beads with powdered sodium silicate in an amount of 2% to 40% by weight.
Claim 3
Dependent Claim
37 words
A method according to claim 1, wherein the phosphate is sodium tripolyphosphate, the non-ionic is a C 10 -C 18 linear alcohol containing at least 5 moles of condensed ethylene oxide and the silicate is sodium metasilicate.
Claim 4
Dependent Claim
23 words
A method according to claim 1, wherein the polymer is a polyacrylate and comprises 0.5% to 10% by weight of the total components.
Claim 5
Dependent Claim
17 words
A method according to claim 3, wherein a bleaching agent is added during the dry mixing step.
Claim 6
Dependent Claim
19 words
A method according to claim 4, wherein the bleaching agent is a chloroisocyanurate or an alkali or calcium hypochlorite.
Claim 7
Dependent Claim
24 words
A method according to claim 1, wherein the resulting composition has a bulk density of from 0.4 to 0.64, in terms of specific gravity.
Claim 8
Dependent Claim
24 words
A method according to claim 2, wherein the resulting composition has a bulk density of from 0.4 to 0.64, in terms of specific gravity.
Claim 9
Dependent Claim
40 words
A method for cleaning dishes and the like in an automatic dishwasher which comprises adding to the dishwasher, a free-flowing composition made in accordance with the method of claim 1 and thereafter putting the machine through its normal washing cycle.
Claim 10
Dependent Claim
19 words
The method of claim 8 wherein the free-flowing composition is added to the dispenser means of the automatic dishwasher.
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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) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |