Patent US4818436A successfully refreshed from Google Patents.
US4818436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and composition for providing reduced discoloration of pyrithiones
Assignee: Arch Chemicals Inc
•
Filing: 1987-08-31
•
Granted: 1989-04-04
•
Expires: 2007-08-31
Abstract
Abstract Aqueous pyrithiones and a process and composition for providing reduced discoloration of these pyrithiones using an alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid.
Inventors
- 👤 Cheryl B. French
- 👤 Gene A. Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:21
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/89; C01; C01G; C01G49/00; C01G49/0009; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/38; C22B3/386; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
56 words
A process for reducing or inhibiting the formation of a blue coloration in a metalworking fluid, said blue coloration being due to the presence of ferric ion and sodium pyrithione in said metalworking fluid, which comprises adding to said metalworking fluid an effective amount of an alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid.
Claim 2
Dependent Claim
56 words
A process for reducing or inhibiting the formation of a blue coloration in a metalworking fluid, said blue coloration being due to the presence of ferric ion and sodium pyrithione in said metalworking fluid, which comprises adding to said metalworking fluid an effective amount of an alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid.
Claim 3
Dependent Claim
75 words
The process of claim 1 wherein said sodium pyrithione is present in an amount of at least about 45 ppm in said metalworking fluid and wherein said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is present in said metalworking fluid in an effective amount of between about 33 and about 75 weight percent based on the total amount of said salt of 1-hydroxyethane-1,1-diphosphonic acid plus acid sodium pyrithione in said metalworking fluid.
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is HEDP-K 4 .
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the amount of said ferric ion dissolved in said metalworking fluid is no greater than about 150 ppm.
Claim 6
Dependent Claim
79 words
A process for reducing or inhibiting the formation of a blue coloration in an aqueous concentrate of a metalworking fluid, said blue coloration being due to the presence of ferric ion and sodium pyrithione in said aqueous concentrate, which comprises adding to said aqueous concentrate an effective amount of an alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid, the amount of said sodium pyrithione in said aqueous concentrate being between about 450 ppm and about 5000 ppm.
Claim 7
Dependent Claim
79 words
A process for reducing or inhibiting the formation of a blue coloration in an aqueous concentrate of a metalworking fluid, said blue coloration being due to the presence of ferric ion and sodium pyrithione in said aqueous concentrate, which comprises adding to said aqueous concentrate an effective amount of an alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid, the amount of said sodium pyrithione in said aqueous concentrate being between about 450 ppm and about 5000 ppm.
Claim 8
Dependent Claim
55 words
The process of claim 5 wherein said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is present in said metalworking fluid in an effective amount of between about 33 and about 75 weight percent based on the total amount of said salt of 1-hydroxyethane-1,1-diphosphonic acid plus said sodium pyrithione in said metalworking fluid.
Claim 9
Dependent Claim
21 words
The process of claim 6 wherein said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is HEDP-K 4 .
Claim 10
Dependent Claim
57 words
In an improved metalworking fluid composition containing ferric ion and sodium pyrithione, the improvement comprising said composition additionally containing an alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid in an amount sufficient to inhibit or prevent any blue coloration in said metalworking fluid caused by the presence of said ferric ion and said sodium pyrithione.
Claim 11
Dependent Claim
57 words
In an improved metalworking fluid composition containing ferric ion and sodium pyrithione, the improvement comprising said composition additionally containing an alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid in an amount sufficient to inhibit or prevent any blue coloration in said metalworking fluid caused by the presence of said ferric ion and said sodium pyrithione.
Claim 12
Dependent Claim
73 words
The composition of claim 8 wherein said sodium pyrithione is present in an amount of at least about 45 ppm in said composition and wherein said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is present in said composition in an effective amount of between about 33 and about 75 weight percent based on the total amount of said salt of 1-hydroxyethane-1,1-diphosphonic acid plus said sodium pyrithione in said metalworking fluid.
Claim 13
Dependent Claim
21 words
The comosition of claim 9 wherein said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is HEDP-K 4 .
Claim 14
Dependent Claim
22 words
The composition of claim 8 which is an aqueous concentrate containing between about 450 and about 5000 ppm of said sodium pyrithione.
Claim 15
Dependent Claim
52 words
The composition of claim 11 wherein said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is present in said metalworking fluid in an effective amount of between about 33 and about 75 weight percent based on the total amount of 1-hydroxyethane-1,1-diphosphonic acid and said sodium pyrithione in said metalworking fluid.
Claim 16
Dependent Claim
21 words
The composition of claim 12 wherein said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is HEDP-K 4 .
References Cited (Backward Citations)
US2809971A
Cited
US3159640A
Cited
DE2262375A1
Cited
US3899293A
Cited
US4557896A
Cited
EP0077630A1
Cited
US4533736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |