US2665279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterocyclic antituberculous compounds
Assignee: F Hoffmann La Roche AG
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Filing: 1952-07-02
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Granted: 1954-01-05
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Expires: 1972-07-02
Abstract
No abstract record available.
Inventors
- 👤 Aeschlimann John Alfred
- 👤 Stempel Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:49
CPC Classifications
C; C07; C07D; C07D413/00; C07D413/02; C07D413/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
A COMPOUND SELECTED FROM THE CLASS CONSISTING OF 5-(4-PYRIDYL)-1,3,4-OXADIAZOL-2(3H)ONE AND 3-LOWER ALKYL-5-(4-PYRIDYL)-1,3,4-OXADIAZOL-2(3H)-ONE. 5. 1-ISONICOTINYL-CARBOHYDRAZIDE.
Claim 2
Dependent Claim
14 words
A COMPOUND SELECTED FROM THE CLASS CONSISTING OF 5-(4-PYRIDYL)-1,3,4-OXADIAZOL-2(3H)ONE AND 3-LOWER ALKYL-5-(4-PYRIDYL)-1,3,4-OXADIAZOL-2(3H)-ONE. 5. 1-ISONICOTINYL-CARBOHYDRAZIDE.
Claim 3
Dependent Claim
24 words
A PROCESS OF PREPARING ISONICOTINIC ACID HYDRAZIDE WHICH COMPRISES REACTING 5-(4-PYRIDYL)1,3,4-OXADIAZOL-2(3H) -ONE WITH A PRIMARY AMINE, AT A REACTION TEMPERATURE ABOVE ABOUT 130* C.
Claim 4
Dependent Claim
24 words
A PROCESS OF PREPARING ISONICOTINIC ACID HYDRAZIDE WHICH COMPRISES REACTING 5-(4-PYRIDYL)1,3,4-OXADIAZOL-2(3H) -ONE WITH A PRIMARY AMINE, AT A REACTION TEMPERATURE ABOVE ABOUT 130* C.
References Cited (Backward Citations)
DE730292C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |