US2658864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of mercaptothiazoles
Assignee: Wyeth Holdings LLC
•
Filing: 1949-12-23
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Granted: 1953-11-10
•
Expires: 1969-12-23
Abstract
No abstract record available.
Inventors
- 👤 Robert H Ebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:00
CPC Classifications
C; C07; C07D; C07D277/00; C07D277/60; C07D277/62; C07D277/68; C07D277/70; C07D277/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
IN THE METHOD OF WORKING UP 2-MERCAPTOBENZOTHIAZOLE, CONTAINING BENZOTHIAZOLE AS AN IMPURITY, PREPARED BY REACTING ANILINE, CARBON BISULFIDE, AND SULFUR, THE IMPROVED MEHTOF OF REMOVING BENZOTHIAZOLE WHICH CONSISTS OF SUBJECTING THE MOLTEN PRODUCT TO DISTILLATION WITH STEAM AT TEMPERATURES OF 170-240* C. FOR SUFFICIENT TIME
Claim 2
Dependent Claim
45 words
IN THE METHOD OF WORKING UP 2-MERCAPTOBENZOTHIAZOLE, CONTAINING BENZOTHIAZOLE AS AN IMPURITY, PREPARED BY REACTING ANILINE, CARBON BISULFIDE, AND SULFUR, THE IMPROVED MEHTOF OF REMOVING BENZOTHIAZOLE WHICH CONSISTS OF SUBJECTING THE MOLTEN PRODUCT TO DISTILLATION WITH STEAM AT TEMPERATURES OF 170-240* C. FOR SUFFICIENT TIME
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) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |