Patent US3012033A successfully refreshed from Google Patents.
US3012033A
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New substituted phthalazines and process for their preparation
Assignee: Deutsches Hydrierwerk Rodleben VEB
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Filing: 1958-07-23
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Granted: 1961-12-05
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Expires: 1978-07-23
Abstract
No abstract record available.
Inventors
- 👤 Engelbrecht Heinz-Joachim
- 👤 Muller Hildegard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:19
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/41; A61K31/425; A61K31/429; A61K31/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
AS A COMPOSITION OF MATTER OF PHTHALAZINE OF FORMULA
Claim 2
Dependent Claim
9 words
AS A COMPOSITION OF MATTER OF PHTHALAZINE OF FORMULA
References Cited (Backward Citations)
US2642437A
Cited
US2736727A
Cited
US2566376A
Cited
US2748116A
Cited
US2744139A
Cited
US2838510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |