Patent US4572468A successfully refreshed from Google Patents.
Patent US4038479A successfully refreshed from Google Patents.
US4038479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amino purine derivatives
Assignee: SmithKline Beecham Corp
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Filing: 1971-09-07
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Granted: 1977-07-26
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Expires: 1991-09-07
Abstract
Abstract Compounds of the formula ##STR1## where R 1 is amino or lower alkylamino, R 2 is amine or hydrogen and pharmaceutically acceptable salts thereof, provided that when R 1 is amino, R 2 is amino. The compounds are useful as immune suppressants and as antivirals.
Inventors
- 👤 Gertrude B. Elion
- 👤 Robert A. Strelitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:01
CPC Classifications
C; C07; C07H; C07H19/00; C07H19/02; C07H19/04; C07H19/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
1 words
2,6-diamino-9-(β-D-arabinofuranosyl)purine.
Claim 2
Dependent Claim
1 words
2,6-diamino-9-(β-D-arabinofuranosyl)purine.
Claim 3
Dependent Claim
6 words
A pharamaceutically acceptable salt of 2,6-diamino-9-(β-D-arabinofuranosyl)purine.
Claim 4
Dependent Claim
6 words
A pharamaceutically acceptable salt of 2,6-diamino-9-(β-D-arabinofuranosyl)purine.
References Cited (Backward Citations)
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US3298923A
Cited
GB1070413A
Cited
US3269917A
Cited
US3498970A
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |