US4146715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-amido-9-(2-acyloxyethoxymethyl)hypoxanthines
Assignee: SmithKline Beecham Corp
•
Filing: 1977-02-28
•
Granted: 1979-03-27
•
Expires: 1997-02-28
Abstract
Abstract Method of preparing 9-(2-hydroxyethoxymethyl)guanine which comprises preparing the compound ##STR1## wherein R and R 1 are hydrogen, lower alkyl and phenyl and then hydrolyzing same. 9-(2-hydroxyethoxymethyl)guanine is useful as an antiviral.
Inventors
- 👤 Howard J. Schaeffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:16
CPC Classifications
C; C07; C07D; C07D473/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
A compound of the formula ##STR8## wherein R and R 1 are selected from hydrogen, lower alkyl of 1 to 4 carbon atoms, or phenyl.
Claim 2
Dependent Claim
25 words
A compound of the formula ##STR8## wherein R and R 1 are selected from hydrogen, lower alkyl of 1 to 4 carbon atoms, or phenyl.
Claim 3
Dependent Claim
20 words
A compound of claim 1 wherein R and R 1 are both lower alkyl of 1 to 4 carbon atoms.
Claim 4
Dependent Claim
12 words
A compound of claim 1 wherein R and R 1 are phenyl.
Claim 5
Dependent Claim
12 words
The compound of claim 1 wherein R and R 1 are methyl.
Claim 6
Dependent Claim
19 words
The compound of claim 1 wherein ##STR9## are formyl, acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, 2-methyl butyryl, or benzoyl.
References Cited (Backward Citations)
US3498970A
Cited
BE833006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |