US3201421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alkyl psoralens
Assignee: Department OF CHEMISTRY
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Filing: 1962-05-09
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Granted: 1965-08-17
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Expires: 1982-05-09
Abstract
No abstract record available.
Inventors
- 👤 Kurt D Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:15
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/04; C07C; C07C37/00; C07C37/01; C07C37/055; C07C37/0555; C07D311/00; C07D311/02; C07D311/04; C07D311/06; C07D311/08; C07D311/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
11 words
THE METHOD OF PREPARING THE COMPOUND (A) HAVING THE STRUCTURAL FORMULA:
References Cited (Backward Citations)
US2647133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |