US2879271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Basic derivatives of mono- and dimethyl xanthines, and a process of making same
Assignee: Abbott GmbH and Co KG
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Filing: 1954-07-20
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Granted: 1959-03-24
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Expires: 1974-07-20
Abstract
No abstract record available.
Inventors
- 👤 Kallischnigg Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:20
CPC Classifications
C; C07; C07D; C07D473/00; C07D473/02; C07D473/04; C07D473/06; C07D473/10; C07D473/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
19 words
AN 8-DI-N-BUTYLAMINO ALKYL THEOPHYLLINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN 8-DI-N-BUTYLAMINO LOWER ALKYL THEOPHYLLINE OF THE FORMULA
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |