US3899505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing 1,3,4-thiadiazol-2-ylureas
Assignee: Air Products and Chemicals Inc
•
Filing: 1970-01-19
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Granted: 1975-08-12
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Expires: 1990-01-19
Abstract
Abstract Certain 2-alkylamino-1,3,4-thiadiazole compounds are reacted with N,N-dialkylcarbamoyl chlorides in the presence of sodium metalating agents to provide fully substituted 1,3,4-thiadiazol2-ylurea compounds.
Inventors
- 👤 Tony Cebalo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:46
CPC Classifications
C; C07; C07D; C07D285/00; C07D285/01; C07D285/02; C07D285/04; C07D285/12; C07D285/125; C07D285/135
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
10 words
A METHOD FOR PRODUCING 1,3,4-THIADIAZOL-2-YLUREA COMPOUNDS HAVING THE GENERAL STRUCTURE:
Claim 2
Independent Claim
10 words
A METHOD FOR PRODUCING 1,3,4-THIADIAZOL-2-YLUREA COMPOUNDS HAVING THE GENERAL STRUCTURE:
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the N,N-dialkylcarbamoyl chloride compound is N,N-dimethylcarbamoyl chloride.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the sodium metalating agent is sodium hydride.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein R1 is pentafluoroethyl, and R2, R3 and R4 are methyl.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein R1 is difluoromethyl and R2, R3 and R4 are methyl.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein R1 is tertiary-butyl and R2, R3 and R4 are methyl.
References Cited (Backward Citations)
US3565901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |