Patent US3724153A successfully refreshed from Google Patents.
Patent US4855466A successfully refreshed from Google Patents.
US4855466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purinyl cyclobutanes
Assignee: ER Squibb and Sons LLC
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Filing: 1987-12-28
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Granted: 1989-08-08
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Expires: 2007-12-28
Abstract
Abstract Disclosed are compounds having the formula ##STR1## wherein Prot is a hydroxyl protecting group. The compounds are useful as intermediates in the preparation of compounds of the formula ##STR2## which in turn are useful as antiviral agents.
Inventors
- 👤 Robert Zahler
- 👤 Glenn A. Jacobs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:49
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/46; C07D239/47; A; A61; A61P; A61P31/00; A61P31/12; C07D239/52; C07D239/54; C07D303/00; C07D303/02; C07D303/12; C07D303/18; C07D303/20; C07D303/22; C07D473/00; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A compound having the formula ##STR22## wherein Prot is a hydroxyl protecting group.
Claim 2
Dependent Claim
13 words
A compound having the formula ##STR22## wherein Prot is a hydroxyl protecting group.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |