US2887486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Theophylline derivatives
Assignee: The SE Massengill Co
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Filing: 1956-10-29
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Granted: 1959-05-19
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Expires: 1976-10-29
Abstract
No abstract record available.
Inventors
- 👤 Norman H Leake
- 👤 Marvel L Fielden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:30
CPC Classifications
C; C07; C07D; C07D473/00; C07D473/02; C07D473/04; C07D473/06; C07D473/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF 7-DI-(LOWER-ALKYL)-AMINO-(LOWER-ALKYL)-THEOPYLINE HAVING AN 8-SUBSTITUENT SELECTED FTOM THE GROUP CONSISTING OF PHENYL-(LOWER-ALKYL) AND (LOWER-ALOXY)-PHENYL-(LOWERALKYL), THEIR ACID SALTS AND THEIR QUARTERNARY AMMONIUM SALTS SELECTED FROM THE GROUP CONSISTING OF LOWER-ALKYL, LOWER ALKINYL AND PHENYL-LOWER-ALKYL QUARTENARY AMMONIUM SALTS.
Claim 2
Dependent Claim
42 words
COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF 7-DI-(LOWER-ALKYL)-AMINO-(LOWER-ALKYL)-THEOPYLINE HAVING AN 8-SUBSTITUENT SELECTED FTOM THE GROUP CONSISTING OF PHENYL-(LOWER-ALKYL) AND (LOWER-ALOXY)-PHENYL-(LOWERALKYL), THEIR ACID SALTS AND THEIR QUARTERNARY AMMONIUM SALTS SELECTED FROM THE GROUP CONSISTING OF LOWER-ALKYL, LOWER ALKINYL AND PHENYL-LOWER-ALKYL QUARTENARY AMMONIUM SALTS.
References Cited (Backward Citations)
US2641598A
Cited
US2799675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |