Patent US3081314A successfully refreshed from Google Patents.
US3081314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing 3, 4-dimethoxy-toluquinone
Assignee: F Hoffmann La Roche AG
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Filing: 1960-05-24
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Granted: 1963-03-12
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Expires: 1980-05-24
Abstract
No abstract record available.
Inventors
- 👤 Goel Ram Niwas
- 👤 Ruegg Rudolf
- 👤 Schwieter Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:21
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/76; C07C49/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A PROCESS OF MAKING 3,4-DIMETHOXYTOLUQUINONE WHICH COMPRISES COUPLING 3,4,5-TRIMETHOXYTOLUENE WITH A DIAZONIUM SALT OF P-NITROANILINE, REDUCING THE AZO COMPOUND OBTAINED TO 2-METHYL-4,5,6-TRIMETHOXYANILINE, AND OXIDIZING THE LATTER.
Claim 2
Dependent Claim
26 words
A PROCESS OF MAKING 3,4-DIMETHOXYTOLUQUINONE WHICH COMPRISES COUPLING 3,4,5-TRIMETHOXYTOLUENE WITH A DIAZONIUM SALT OF P-NITROANILINE, REDUCING THE AZO COMPOUND OBTAINED TO 2-METHYL-4,5,6-TRIMETHOXYANILINE, AND OXIDIZING THE LATTER.
References Cited (Backward Citations)
US1318631A
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US1892310A
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US2231707A
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US2285243A
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US2423542A
Cited
US2381877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |