US3317564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing chromans
Assignee: F Hoffmann La Roche AG
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Filing: 1964-06-26
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Granted: 1967-05-02
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Expires: 1984-06-26
Abstract
No abstract record available.
Inventors
- 👤 Ruegg Rudolf
- 👤 Schudel Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:39
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58; C07D311/70; C07D311/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A PROCESS FOR PRODUCING A CHROMAN COMPOUND OF THE FORMULA 2-(H3C-),2-(H3C-(C(-CH3)=CH-CH2-CH2)N-),5-R1,6-(R4-O-), 7-R2,8-R3-2H-CHROMAN IN WHICH R1 IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL AND ALKOXY; R2 IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN ALKYL AND ALKOXY; R3 IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL AND ALKOXY; R4 IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND ALKYL; AND N IS AN INTEGER OF FROM 1 TO 9, INCLUSIVE, WITH THE PROVISO THAT AT LEAST ONE OF THE SYMBOLS R1, R2 AND R3 REPRESENT A MEMBER OTHER THAN HYDROGEN WHICH COMPRISES REDUCING A MEMBER SELECTED FROM THE GROUP CONSISTING OF A CHROMENE COMPOUND OF THE FORMULA 2-(H3C-),2-(H3C-(C(-CH3)=CH-CH2-CH2)N-),5-R1,6-(R4-O-), 7-R2,8-R3-2H-CHROMENE IN WHICH SYMBOLS R1, R2, R3, R4 AND N HAVE THE SAME SIGNIFICANCE AS STATED ABOVE AND AN ESTER OF SAID CHROMENE COMPOUND, SAID REDUCTION BEING EFFECTED BY HEATING SAID CHROMENE COMPOUND, WHILE DISSOLVED IN AN ALCOHOL, WITH AN ALKALI METAL.
Claim 2
Dependent Claim
160 words
A PROCESS FOR PRODUCING A CHROMAN COMPOUND OF THE FORMULA 2-(H3C-),2-(H3C-(C(-CH3)=CH-CH2-CH2)N-),5-R1,6-(R4-O-), 7-R2,8-R3-2H-CHROMAN IN WHICH R1 IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL AND ALKOXY; R2 IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN ALKYL AND ALKOXY; R3 IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL AND ALKOXY; R4 IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND ALKYL; AND N IS AN INTEGER OF FROM 1 TO 9, INCLUSIVE, WITH THE PROVISO THAT AT LEAST ONE OF THE SYMBOLS R1, R2 AND R3 REPRESENT A MEMBER OTHER THAN HYDROGEN WHICH COMPRISES REDUCING A MEMBER SELECTED FROM THE GROUP CONSISTING OF A CHROMENE COMPOUND OF THE FORMULA 2-(H3C-),2-(H3C-(C(-CH3)=CH-CH2-CH2)N-),5-R1,6-(R4-O-), 7-R2,8-R3-2H-CHROMENE IN WHICH SYMBOLS R1, R2, R3, R4 AND N HAVE THE SAME SIGNIFICANCE AS STATED ABOVE AND AN ESTER OF SAID CHROMENE COMPOUND, SAID REDUCTION BEING EFFECTED BY HEATING SAID CHROMENE COMPOUND, WHILE DISSOLVED IN AN ALCOHOL, WITH AN ALKALI METAL.
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) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |