US2883391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making 2-amino-5-substituted-1,3,4-oxadiazoles
Assignee: Janssen Pharmaceuticals Inc
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Filing: 1957-06-25
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Granted: 1959-04-21
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Expires: 1977-06-25
Abstract
No abstract record available.
Inventors
- 👤 Ansel P Swain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:08
CPC Classifications
C; C07; C07D; C07D271/00; C07D271/02; C07D271/10; C07D271/113; C07D413/00; C07D413/02; C07D413/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
THE METHOD OF MAKING 2-AMINO-5-SUBSTITUTED-1,3,4OXADIAZOLES WHICH COMPRISES REACTING A CARBOXYLIC ACID HYDRAZIDE WITH A CYANOGEN HALIDE SELECTED FROM THE GROUP CONSISTING OF CYANOGEN BROMIDE AND CYANOGEN CHLORIDE.
Claim 2
Independent Claim
27 words
THE METHOD OF MAKING 2-AMINO-5-SUBSTITUTED-1,3,4OXADIAZOLES WHICH COMPRISES REACTING A CARBOXYLIC ACID HYDRAZIDE WITH A CYANOGEN HALIDE SELECTED FROM THE GROUP CONSISTING OF CYANOGEN BROMIDE AND CYANOGEN CHLORIDE.
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) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |