US2914542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction product of 1-aminoanthraquinone and o-phthalyl chloride
Assignee: GAF Chemicals Corp
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Filing: 1956-09-20
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Granted: 1959-11-24
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Expires: 1976-09-20
Abstract
No abstract record available.
Inventors
- 👤 David I Randall
- 👤 Taras John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:45
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/42; C09B1/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A PROCESS COMPRISING REACTING 1 MOLE OF 1-AMINOANTHRAQUINONE WITH FROM 0.6 TO 2 MOLES OF O-PHTHALYL CHLORIDE AT A TEMPERATURE OF ABOUT 150 TO 210*C. IN AN INERT ORGANIC LIQUID DILUENT, AND THEN SEPARATING THE RESULTING REACTION PRODUCT FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
42 words
A PROCESS COMPRISING REACTING 1 MOLE OF 1-AMINOANTHRAQUINONE WITH FROM 0.6 TO 2 MOLES OF O-PHTHALYL CHLORIDE AT A TEMPERATURE OF ABOUT 150 TO 210*C. IN AN INERT ORGANIC LIQUID DILUENT, AND THEN SEPARATING THE RESULTING REACTION PRODUCT FROM THE REACTION MIXTURE.
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) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |