Patent US4045244A successfully refreshed from Google Patents.
US4045244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of microbiological deposits
Assignee: Veolia WTS USA Inc
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Filing: 1976-05-05
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Granted: 1977-08-30
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Expires: 1996-05-05
Abstract
Abstract The present disclosure is directed to methods and agents for detaching and dispersing microbiological deposits which occur on support materials in contact with aqueous systems. The method includes adding to the aqueous medium and thereby contacting the deposits with from about 1 to 100 parts per million of an agent which possesses hydrogen-bonding characteristics. Preferred agents include but are not limited to urea, ethanolamine, water-soluble acrylamide polymers, and water-soluble reaction products of amines, and epoxy or expoxy precursor compounds and mixtures thereof.
Inventors
- 👤 K. Robert Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:41
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C11; C11D; C11D7/00; C11D7/22; C11D7/32; C11D7/3209; C11D7/3218; C11D7/3272
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A method of detaching hydrated slime adhered to a support in an aqueous medium which comprises contacting said aqueous slime with urea in an amount of from about 1 to about 100parts per million parts of aqueous medium and to penetrate the strongly hydrated slime structure and modify such to the extent that the slime is detached from the support.
Claim 2
Independent Claim
60 words
A method of detaching hydrated slime adhered to a support in an aqueous medium which comprises contacting said aqueous slime with urea in an amount of from about 1 to about 100parts per million parts of aqueous medium and to penetrate the strongly hydrated slime structure and modify such to the extent that the slime is detached from the support.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the slime is primarily fungal and bacterial slimes.
Claim 4
Dependent Claim
31 words
A method according to claim 2 wherein the agent is added to the aqueous medium in an amount of from about 10 to 75 parts per million parts of aqueous medium.
Claim 5
Dependent Claim
15 words
A method according to claim 3 wherein the slime is previously an Aerobacter Aerogenes slime.
Claim 6
Dependent Claim
74 words
A composition for detaching slime adhered to a support in an aqueous medium which consists essentially of: i. urea; and ii. at least one member of the group consisting of ethanolamine, amine-epoxy compound reaction products and derivatives of each so long as the derivatives have hydrogen-bonding characteristics, wherein the members of (i) and (ii) are present in the composition in a weight ratio of from about 5 to 95% and 95 to 5% respectively.
Claim 7
Dependent Claim
74 words
A composition for detaching slime adhered to a support in an aqueous medium which consists essentially of: i. urea; and ii. at least one member of the group consisting of ethanolamine, amine-epoxy compound reaction products and derivatives of each so long as the derivatives have hydrogen-bonding characteristics, wherein the members of (i) and (ii) are present in the composition in a weight ratio of from about 5 to 95% and 95 to 5% respectively.
Claim 8
Dependent Claim
15 words
A composition according to claim 5 where the composition consists essentially of urea and ethanolamine.
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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |