US2517410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxy alkyl xanthines and the production thereof
Assignee: GD Searle LLC
•
Filing: 1947-08-15
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Granted: 1950-08-01
•
Expires: 1967-08-15
Abstract
No abstract record available.
Inventors
- 👤 Papesch Viktor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:48
CPC Classifications
C; C07; C07D; C07D473/00; C07D473/02; C07D473/04; C07D473/06; C07D473/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
A HYDROXYALKYLXANTHINE HAVING THE FORMULA
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-31 | 1954-01-30 | 1954-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-31 | 1958-01-30 | 1958-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-31 | 1962-01-30 | 1962-08-01 | $7700.00 | Window Closed / Lapsed |