US4420412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activation of hypochlorite bleaching of dyes
Assignee: Procter and Gamble Co
•
Filing: 1981-12-23
•
Granted: 1983-12-13
•
Expires: 2001-12-23
Abstract
Abstract A method of bleaching of certain triarylmethane dyes in aqueous systems with low concentration of hypochlorite ion, activated by the presence of bromide ion and ammonium ions. The method is particularly useful in providing a disappearing color signal in the automatic cleaning and sanitizing of toilet bowls with low concentrations of hypochlorite. Compositions and articles for implementing the practice of the method in the automatic cleaning and sanitizing of toilet bowls are also disclosed.
Inventors
- 👤 Louis F. Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:18
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/395; C11D3/3951; A; A61; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/05; D; D06; D06L; D06L4/00; D06L4/20; D06L4/22; D06L4/23
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A method of bleaching water-soluble, ortho-substituted triarylmethane dyes which have in their structure the moiety ##STR4## wherein X is selected from the group consisting of substituent groups other than hydrogen or methyl and Y is selected from the group consisting of X, hydrogen and methyl, said method comprising the step of forming a solution comprising from about 0.02 to about 2 ppm of said dye, from about 2 to about 30 ppm of available chlorine from hypochlorite ion, at least about 0.1 ppm bromide ion and at least about 0.1 ppm ammonium ion, the available chlorine to dye ratio in said solution being from about 2:1 to about 150:1, and the pH of said solution being from about 6 to about 9.5.
Claim 2
Independent Claim
122 words
A method of bleaching water-soluble, ortho-substituted triarylmethane dyes which have in their structure the moiety ##STR4## wherein X is selected from the group consisting of substituent groups other than hydrogen or methyl and Y is selected from the group consisting of X, hydrogen and methyl, said method comprising the step of forming a solution comprising from about 0.02 to about 2 ppm of said dye, from about 2 to about 30 ppm of available chlorine from hypochlorite ion, at least about 0.1 ppm bromide ion and at least about 0.1 ppm ammonium ion, the available chlorine to dye ratio in said solution being from about 2:1 to about 150:1, and the pH of said solution being from about 6 to about 9.5.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein X is selected from the group consisting of halogen, sulfonate, carboxylate, phosphate and hydroxyl and wherein Y is hydrogen.
Claim 4
Dependent Claim
36 words
The method of claim 2 wherein the concentration of available chlorine is from about 3 ppm to about 8 ppm and the weight ratio of available chlorine to dye is from about 5:1 to about 60:1.
Claim 5
Dependent Claim
33 words
The method of claim 3 wherein the concentration of bromide ion is from about 0.1 to about 3 ppm and the concentration of ammonium ion is from about 0.1 to about 2 ppm.
Claim 6
Dependent Claim
26 words
The method of claim 4 wherein the dye is selected from the group consisting of those having Color Index Number designations 42053, 42090, 42045 and 42100.
Claim 7
Dependent Claim
53 words
The method of claim 5 wherein the dye is selected from the group consisting of those designated by Color Index Numbers 42090, 42053 and 42100, the concentration of bromide ion is from about 0.2 ppm to about 1 ppm and the concentration of ammonium ion is from about 0.2 to about 1 ppm.
References Cited (Backward Citations)
CA519002A
Cited
US2320279A
Cited
GB596192A
Cited
GB596193A
Cited
BE557828A
Cited
US3120424A
Cited
BE562976A
Cited
US2987435A
Cited
AU3918758A
Cited
US3156521A
Cited
GB1071494A
Cited
US3504384A
Cited
GB1137474A
Cited
US3700401A
Cited
US3547573A
Cited
US4113645A
Cited
GB2007657A
Cited
US4248827A
Cited
US4200606A
Cited
US4281421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |