Patent US4659830A successfully refreshed from Google Patents.
US4659830A
Expired / Lapsed
US
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Process for the production of zinc 2-mercaptopyridine N-oxide
Assignee: Ruetgers Organics GmbH
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Filing: 1986-07-15
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Granted: 1987-04-21
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Expires: 2006-07-15
Abstract
Abstract The present invention relates to a process for the preparation of zinc 2-mercaptopyridine-N-oxide in a readily filterable, washable and easily suspendable form which comprises reacting an aqueous solution of an alkali metal salt of 2-mercaptopyridine N-oxide with an aqueous solution of a water soluble zinc salt at a temperature of 35° to 100° C. in the presence of an at least partially water soluble organic solvent to form a precipitate of zinc 2-mercaptopyridine-N-oxide, recovering the said crystals and optionally comminuting the crystals.
Inventors
- 👤 Manfred Maurer
- 👤 Winifried Orth
- 👤 Werner Fickert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:47
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/89
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
Crystals of zinc 2-mercaptopyridine-N-oxide in a readily filterable, washable and easily suspendable form prepared by reacting in the absence of a surfactant an aqueous solution of an alkali metal salt of 2-mercaptopyridine N-oxide and an aqueous solution of a water soluble zinc salt at a temperature in the range of 35° to 100° C. in the presence of 10 to 50% by weight of an at least partially water soluble organic solvent based on the weight of the sodium 2-mercaptopyridine N-oxide solution to form a precipitate of crystalline zinc 2-mercaptopyridine N-oxide, recovering said crystals and optionally comminuting the crystals.
Claim 2
Dependent Claim
99 words
Crystals of zinc 2-mercaptopyridine-N-oxide in a readily filterable, washable and easily suspendable form prepared by reacting in the absence of a surfactant an aqueous solution of an alkali metal salt of 2-mercaptopyridine N-oxide and an aqueous solution of a water soluble zinc salt at a temperature in the range of 35° to 100° C. in the presence of 10 to 50% by weight of an at least partially water soluble organic solvent based on the weight of the sodium 2-mercaptopyridine N-oxide solution to form a precipitate of crystalline zinc 2-mercaptopyridine N-oxide, recovering said crystals and optionally comminuting the crystals.
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) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |