Patent US3268537A successfully refreshed from Google Patents.
US3268537A
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Chromogenous aminophenyl derivatives of benzodifurandione
Assignee: Unisys Corp
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Filing: 1961-08-31
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Granted: 1966-08-23
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Expires: 1981-08-31
Abstract
No abstract record available.
Inventors
- 👤 Earl J Gosnell
- 👤 Jr John F Mccarthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:47
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/04; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; C07D455/00; C07D455/03; C07D455/04; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A MIXTURE OF TWO ISOMERIC COMPOUNDS, INSOLUBLE IN HYDROCHLORIC ACID AND SODIUM HYDROXIDE AND INDIVIDUALLY OF THE FORMULAS
Claim 2
Dependent Claim
18 words
A MIXTURE OF TWO ISOMERIC COMPOUNDS, INSOLUBLE IN HYDROCHLORIC ACID AND SODIUM HYDROXIDE AND INDIVIDUALLY OF THE FORMULAS
References Cited (Backward Citations)
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Cited
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US2935938A
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US3012042A
Cited
US2870040A
Cited
US2940983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |