US3029239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Basic substituted 1-and 7-alkylxanthines or salts thereof
Assignee: Evonik Operations GmbH
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Filing: 1959-10-01
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Granted: 1962-04-10
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Expires: 1979-10-01
Abstract
No abstract record available.
Inventors
- 👤 Kohlstaedt Erwin
- 👤 Klingler Karl Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:45
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
13 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THEOPHYLLINE DERIVATIVES HAVING THE FORMULA
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) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |