Patent US4323683A successfully refreshed from Google Patents.
US4323683A
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US
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Process for making pyridinethione salts
Assignee: Procter and Gamble Co
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Filing: 1980-02-07
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Granted: 1982-04-06
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Expires: 2000-02-07
Abstract
Abstract A process for producing heavy metal, magnesium or aluminum pyridinethione salt crystals involving reacting a water soluble salt of the desired metal with a water soluble pyridinethione salt or pyridinethione itself in an aqueous surfactant medium.
Inventors
- 👤 Raymond E. Bolich, Jr.
- 👤 Steven A. Shaya
- 👤 Christian Steuri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 23:19
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/89; A; A61; A61K; A61K8/00; A61K8/02; A61K8/18; A61K8/30; A61K8/49; A61K8/4906; A61K8/4933; A61Q; A61Q5/00; A61Q5/006; A61Q5/02; A61K2800/00; A61K2800/40; A61K2800/41; A61K2800/412
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
46 words
A process for making heavy metal, magnesium or aluminum N-hydroxy pyridinethione salts comprising reacting 1-hydroxy-2-pyridinethione or a water soluble salt thereof with a water soluble heavy metal, magnesium or aluminum salt in an aqueous surfactant medium, wherein the reaction temperature is at least about 20° C.
Claim 2
Dependent Claim
46 words
A process for making heavy metal, magnesium or aluminum N-hydroxy pyridinethione salts comprising reacting 1-hydroxy-2-pyridinethione or a water soluble salt thereof with a water soluble heavy metal, magnesium or aluminum salt in an aqueous surfactant medium, wherein the reaction temperature is at least about 20° C.
Claim 3
Dependent Claim
33 words
A process according to claim 1 wherein the pyridinethione compound is an alkali metal pyridinethione salt and the concentration of surfactant in the total reaction mixture is from about 1% to about 24%.
Claim 4
Dependent Claim
39 words
A process according to claim 2 wherein the metal salt is a heavy metal salt selected from the group consisting of zinc, tin, cadmium and zirconium salts and is present in an amount sufficient to provide a stoichiometric excess.
Claim 5
Dependent Claim
11 words
A process according to claim 3 wherein the surfactant is anionic.
Claim 6
Dependent Claim
15 words
A process according to claim 4 wherein the heavy metal salt is a zinc salt.
Claim 7
Dependent Claim
19 words
A process according to claim 5 wherein the reaction temperature is from about 60° C. to about 100° C.
Claim 8
Dependent Claim
18 words
A process according to claim 6 wherein the concentration of surfactant is from about 1% to about 8%.
Claim 9
Dependent Claim
15 words
A process according to claim 7 wherein the alkali metal pyridinetione salt is sodium pyridinethione.
Claim 10
Dependent Claim
13 words
A process according to claim 8 wherein the zinc salt is zinc sulfate.
Claim 11
Dependent Claim
14 words
A process according to claim 9 wherein the anionic surfactant is an alkyl sulfate.
Claim 12
Dependent Claim
14 words
A process according to claim 10 wherein the alkyl sulfate is sodium alkyl sulfate.
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) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |