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US3261836A
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Process for producing linear quinacridones
Assignee: EIDP Inc
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Filing: 1962-10-15
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Granted: 1966-07-19
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Expires: 1982-10-15
Abstract
No abstract record available.
Inventors
- 👤 Chung C Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:46
CPC Classifications
C; C09; C09B; C09B48/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
IN A PROCESS FOR THE PRODUCTION OF A LINEAR QUINACRIDONE THE STEPS COMPRISING CYCLIZING A 2,5-DIARYLAMINOTEREPHTHALIC ACID COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
21 words
IN A PROCESS FOR THE PRODUCTION OF A LINEAR QUINACRIDONE THE STEPS COMPRISING CYCLIZING A 2,5-DIARYLAMINOTEREPHTHALIC ACID COMPOUND OF THE FORMULA
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) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |