US4816061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of biofouling at alkaline pH and/or high water hardness with certain alkylthioalkylamines
Assignee: Dow Chemical Co
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Filing: 1986-10-22
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Granted: 1989-03-28
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Expires: 2006-10-22
Abstract
Abstract Disclosed is a method for inhibiting microorganisms and/or controlling biofouling of cooling towers by use of certain alkylthioalkylamines such as n-decylthioethylamine.
Inventors
- 👤 Richard W. Walter, Jr.
- 👤 Attila G. Relenyi
- 👤 Robert L. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:04
CPC Classifications
A; A01; A01N; A01N33/00; A01N33/02; A01N33/08; C; C02; C02F; C02F1/00; C02F1/50
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
32 words
A method for inhibiting microorganisms at an alkaline pH and at a high water hardness which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 2
Independent Claim
32 words
A method for inhibiting microorganisms at an alkaline pH and at a high water hardness which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 3
Dependent Claim
34 words
The method of claim 1 carried out in an industrial system selected from the group consisting of a cooling tower, a paper mill, a paint or paint film, a cosmetic, and a metalworking fluid.
Claim 4
Dependent Claim
30 words
The method of claim 1 wherein said alkaline pH is between about 7.5 and about 12 and said high water hardness is between about 150 ppm and about 2,000 ppm.
Claim 5
Dependent Claim
29 words
The method of claim 1 wherein said alkaline pH is between about 8 and about 9.5 and said water hardness is between about 300 ppm and about 1,500 ppm.
Claim 6
Independent Claim
27 words
A method for inhibiting microorganisms at a high water hardness which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 7
Independent Claim
27 words
A method for inhibiting microorganisms at a high water hardness which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 8
Dependent Claim
34 words
The method of claim 5 carried out in an industrial system selected from the group consisting of a cooling tower, a paper mill, a paint or paint film, a cosmetic, and a metalworking fluid.
Claim 9
Dependent Claim
19 words
The method of claim 5 wherein said high water hardness is between about 150 ppm and about 2,000 ppm.
Claim 10
Dependent Claim
19 words
The method of claim 5 wherein said high water hardness is between about 300 ppm and about 1,500 ppm.
Claim 11
Independent Claim
26 words
A method for inhibiting microorganisms at an alkaline pH which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 12
Independent Claim
26 words
A method for inhibiting microorganisms at an alkaline pH which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 13
Dependent Claim
34 words
The method of claim 9 carried out in an industrial system selected from the group consisting of a cooling tower, a paper mill, a paint or paint film, a cosmetic, and a metalworking fluid.
Claim 14
Dependent Claim
16 words
The method of claim 9 wherein said alkaline pH is between about 7.5 and about 12.
Claim 15
Dependent Claim
16 words
The method of claim 9 wherein said alkaline pH is between about 8 and about 9.5.
Claim 16
Independent Claim
38 words
A method for controlling biofouling of a recirculation cooling tower system at an alkaline pH and at a high water hardness which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 17
Independent Claim
38 words
A method for controlling biofouling of a recirculation cooling tower system at an alkaline pH and at a high water hardness which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 18
Dependent Claim
30 words
The method of claim 13 wherein said alkaline pH is between about 7.5 and about 12 and said high water hardness is between about 150 ppm and about 2,000 ppm.
Claim 19
Dependent Claim
29 words
The method of claim 13 wherein said alkaline pH is between about 8 and about 9.5 and said water hardness is between about 300 ppm and about 1,500 ppm.
Claim 20
Independent Claim
33 words
A method for controlling biofouling of a recirculating cooling tower system at a high water hardness which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 21
Independent Claim
33 words
A method for controlling biofouling of a recirculating cooling tower system at a high water hardness which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 22
Dependent Claim
19 words
The method of claim 16 wherein said high water hardness is between about 150 ppm and about 2,000 ppm.
Claim 23
Dependent Claim
19 words
The method of claim 16 wherein said high water hardness is between about 300 ppm and about 1,500 ppm.
Claim 24
Independent Claim
32 words
A method for controlling biofouling of a recirculating cooling tower system at an alkaline pH which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 25
Independent Claim
32 words
A method for controlling biofouling of a recirculating cooling tower system at an alkaline pH which comprises contacting said microorganisms with an effective amount of n-decylthioethylamine or the acid addition salts thereof.
Claim 26
Dependent Claim
16 words
The method of claim 19 wherein said alkaline pH is between about 7.5 and about 12.
Claim 27
Dependent Claim
16 words
The method of claim 19 wherein said alkaline pH is between about 8 and about 9.5.
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) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |