Patent US3121102A successfully refreshed from Google Patents.
US3121102A
Expired / Lapsed
US
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Process for preparing sulfonylureas
Assignee: Merck and Co Inc
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Filing: 1959-01-26
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Granted: 1964-02-11
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Expires: 1979-01-26
Abstract
No abstract record available.
Inventors
- 👤 Roger J Tull
- 👤 John M Chemierda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:48
CPC Classifications
C; C07; C07C; C07C311/00; C07C311/50; C07C311/52; C07C311/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
THE PROCESS FOR PREPARING AN ALKALI METAL SALT OF 1-N-BUTYL-3-SULFANILYLUREA THAT COMPRISES REACTING TOGETHER AT A TEMPERATURE OF BETWEEN ABOUT 75*C. AND 250*C. AN ALKALI METAL SALT OF SULFANILAMIDE AND 1,3-DIN-BUTYLUREA, AND CONTINUOUSLY REMOVING N-BUTYLAMINE FROM THE REACTION VESSEL.
Claim 2
Dependent Claim
10 words
THE PROCESS FOR PREPARING A SULFONYLUREA SALT OF THE FORMULA
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) | 1967-02-10 | 1967-08-12 | 1968-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-10 | 1971-08-12 | 1972-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-10 | 1975-08-12 | 1976-02-11 | $7700.00 | Window Closed / Lapsed |