US4339235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and compositions for bleaching of mycological stain
Assignee: Ecolab Inc
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Filing: 1979-12-06
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Granted: 1982-07-13
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Expires: 1999-12-06
Abstract
Abstract Methods and compositions for bleaching and removal of mycological stain are disclosed. The method includes the step of contacting the mycological stain with the composition which includes an improved thixotropic, hypohalite bleach having fumed silica therein. Unexpected potentiation of the composition with respect to bleaching of mycological stain is found.
Inventors
- 👤 Richard C. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:35
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/395; C11D3/3956; C11D17/00; C11D17/0008; C11D17/003; C11D3/02; C11D3/12; C11D3/124
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A method of bleaching mycological stain comprising the step of: contacting the stain with an aqueous composition comprising (a) from about 70% to 99% by weight water; (b) from about 0.5% to 10% by weight salt selected from the group consisting of alkali metal and alkaline earth metal hypochlorites, hypobromites, and mixtures thereof; (c) about 0.5% to 5% by weight fumed silica; (d) about 0% to 2.0% by weight base; the composition contacting the stain a sufficient length of time to bleach essentially all color therefrom;
Claim 2
Independent Claim
86 words
A method of bleaching mycological stain comprising the step of: contacting the stain with an aqueous composition comprising (a) from about 70% to 99% by weight water; (b) from about 0.5% to 10% by weight salt selected from the group consisting of alkali metal and alkaline earth metal hypochlorites, hypobromites, and mixtures thereof; (c) about 0.5% to 5% by weight fumed silica; (d) about 0% to 2.0% by weight base; the composition contacting the stain a sufficient length of time to bleach essentially all color therefrom;
Claim 3
Dependent Claim
15 words
A method according to claim 1 which further comprises flushing the bleached stain with water.
Claim 4
Dependent Claim
12 words
A method according to claim 1 wherein the salt is sodium hypochlorite.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein the composition bleaches essentially all color from said stain in less than three minutes.
Claim 6
Dependent Claim
21 words
A method according to claim 1 wherein the composition bleaches essentially all color from said stain in less than one minute.
References Cited (Backward Citations)
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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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |