Patent US2940972A successfully refreshed from Google Patents.
US2940972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tri-and tetra-substituted pteridine derivatives
Assignee: Boehringer Ingelheim Pharma GmbH and Co KG
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Filing: 1958-06-25
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Granted: 1960-06-14
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Expires: 1978-06-25
Abstract
No abstract record available.
Inventors
- 👤 Roch Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:19
CPC Classifications
C; C07; C07D; C07D475/00; C07D475/06; C07D475/08; C07D475/02; C07D475/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
PTERIDINES HAVING THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
5 words
PTERIDINES HAVING THE STRUCTURAL FORMULA
References Cited (Backward Citations)
US2667486A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |