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Patent US4306988A successfully refreshed from Google Patents.
US4306988A
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US
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Selected poly(oxyalkylated) 1,3,4-thiadiazoles and their use as corrosion inhibitors
Assignee: Arch Chemicals Inc
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Filing: 1980-11-10
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Granted: 1981-12-22
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Expires: 2000-11-10
Abstract
Abstract Disclosed are selected poly(oxyalkylated) 1,3,4-thiadiazoles of the formula: ##STR1## wherein each R is individually selected from hydrogen and methyl; and the sum of y and z is from 2 to about 30. These compounds are shown to be effective corrosion inhibitors in corrosive liquids such as acid metal-treating baths.
Inventors
- 👤 Eugene F. Rothgery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:20
CPC Classifications
C; C07; C07D; C07D285/00; C07D285/01; C07D285/02; C07D285/04; C07D285/12; C07D285/125; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/16; C23F11/165; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C23G1/065
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
An acid metal-treating bath comprising an acid and an effective corrosion-inhibiting amount of a poly (oxyalkylated) 1,3,4-thiadiazole having a formula: ##STR4## wherein each R is individually selected from either H or CH 3 ; and the sum of y and z is from 2 to about 30.
Claim 2
Dependent Claim
47 words
An acid metal-treating bath comprising an acid and an effective corrosion-inhibiting amount of a poly (oxyalkylated) 1,3,4-thiadiazole having a formula: ##STR4## wherein each R is individually selected from either H or CH 3 ; and the sum of y and z is from 2 to about 30.
Claim 3
Dependent Claim
15 words
The acid bath of claim 1 wherein the acid comprises sulfuric acid or hydrochloric acid.
Claim 4
Dependent Claim
20 words
The acid bath of claim 1 wherein the sum of y and z is from about 5 to about 20.
Claim 5
Dependent Claim
58 words
A process for inhibiting corrosion of metal surfaces caused by corrosive aqueous solutions, which comprises contacting said metal surfaces with an effective corrosion-inhibiting amount of a poly(oxyalkylated) 1,3,4-thiadiazole having a formula: ##STR5## wherein each R is individually selected from either H or CH 3 ; and the sum of y and z is from 2 to about 30.
Claim 6
Dependent Claim
58 words
A process for inhibiting corrosion of metal surfaces caused by corrosive aqueous solutions, which comprises contacting said metal surfaces with an effective corrosion-inhibiting amount of a poly(oxyalkylated) 1,3,4-thiadiazole having a formula: ##STR5## wherein each R is individually selected from either H or CH 3 ; and the sum of y and z is from 2 to about 30.
Claim 7
Dependent Claim
10 words
The process of claim 4 wherein each R is H.
Claim 8
Dependent Claim
12 words
The process of claim 4 wherein each R is CH 3 .
Claim 9
Dependent Claim
16 words
The process of claim 4 wherein at least one R is H and CH 3 .
Claim 10
Dependent Claim
19 words
The process of claim 4 wherein the sum of y and z is from about 5 to about 20.
Claim 11
Dependent Claim
38 words
A process of inhibiting the corrosion of metals which come into contact with an acid solution, which comprises contacting the surface of the metal to be inhibited against corrosion with the corrosion-inhibited acid metal-treating bath of claim 1.
Claim 12
Dependent Claim
17 words
The process of claim 9 wherein the acid in acid bath comprises sulfuric acid or hydrochloric acid.
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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) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |