US3822257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 2,1,3-benzothiadiazin-4-one-2,2-dioxides
Assignee: BASF SE
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Filing: 1972-02-03
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Granted: 1974-07-02
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Expires: 1992-02-03
Abstract
Abstract PRODUCTION OF 2,1,3-BENZOTHIADIAZIN-4-ONE-2,2-DIOXIDES BY CYCLIZATION OF AN O-SULFAMIDOBENZOIC ACID IN THE PRESENCE OF PHOSGENE AND A DISUBSTITUTED CARBOXAMIDE OR A TERTIARY AMINE AT A TEMPERATURE OF NOT MORE THAN 50*C. THE PRODUCS ARE PLANT PROTECTION AGENTS AND STARTING MATERIALS FOR THE PRODUCTION OF DYES AND PLANTS PROTECTION AGENTS.
Inventors
- 👤 G Hamprecht
- 👤 K Koenig
- 👤 G Bolz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:46
CPC Classifications
C; C07; C07D; C07D285/00; C07D285/15; C07D285/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |