Patent US4031218A successfully refreshed from Google Patents.
US4031218A
Expired / Lapsed
US
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7-(2,3-Dihydroxypropyl-1,3-di-n-propylxanthine and a pharmaceutical composition containing same useful as a bronchial muscle relaxant
Assignee: Mallinckrodt Inc
•
Filing: 1976-04-28
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Granted: 1977-06-21
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Expires: 1996-04-28
Abstract
Abstract 7-(2,3-dihydroxypropyl)-1,3-di-n-propylxanthine is comparable to theophylline as a bronchodilator but less active in regard to undesired side effects.
Inventors
- 👤 Samir M. El-Antably
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:48
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/46; C07D239/52; C07D239/54; C07D239/545; C07D239/553; A; A61; A61P; A61P11/00; A61P11/08; C07D239/60; C07D239/62; C07D473/00; C07D473/02; C07D473/04; C07D473/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
3 words
The compound 7-(2,3-dihydroxypropyl)-1,3-di-n-propylxanthine.
Claim 2
Dependent Claim
3 words
The compound 7-(2,3-dihydroxypropyl)-1,3-di-n-propylxanthine.
Claim 3
Dependent Claim
39 words
A method for the treatment of reversible airway obstruction due to bronchoconstriction in a living animal body which comprises administering to a living animal body suffering from said obstruction a therapeutically effective amount of the compound of claim 1.
Claim 4
Dependent Claim
20 words
A pharmaceutical composition comprising a pharmaceutically acceptable carrier and a therapeutically effective bronchodilater amount of the compound of claim 1.
References Cited (Backward Citations)
US2756229A
Cited
US2517410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |