Patent US2668171A successfully refreshed from Google Patents.
US2668171A
Expired / Lapsed
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Process for manufacturing copper phthalocyanine
Assignee: EIDP Inc
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Filing: 1952-01-15
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Granted: 1954-02-02
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Expires: 1972-01-15
Abstract
No abstract record available.
Inventors
- 👤 Compton John Denny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:30
CPC Classifications
C; C09; C09B; C09B47/00; C09B47/04; C09B47/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS OF RECOVERING COPPER PHTHALOCYANINE FROM A REACTION MASS IN WHICH THE SAME HAS BEEN PRODUCED FROM PHTHALIC ANHYDRIDE, UREA AND CUPRIC CHLORIDE IN THE PRESENCE OF TRICHLOROBENZENE, WHICH COMPRISES EXTRACTING THE FLUID REACTION MASS WITH AQUEOUS ALKALI-METAL HYDROXIDE, REMOVING THE AQUEOUS PHASE, EXTRACTING THE RESIDUAL ORGANIC PHASE WITH WATER, AT LEAST ONCE, AGAIN REMOVING THE AQUEOUS PHASE, AND EVENTUALLY STEAM DISTILLING THE RESIDUAL ORGANIC PHASE UNTIL ALL THE TRICHLOROBENZENE HAS BEEN DISTILLED OVER.
Claim 2
Dependent Claim
75 words
A PROCESS OF RECOVERING COPPER PHTHALOCYANINE FROM A REACTION MASS IN WHICH THE SAME HAS BEEN PRODUCED FROM PHTHALIC ANHYDRIDE, UREA AND CUPRIC CHLORIDE IN THE PRESENCE OF TRICHLOROBENZENE, WHICH COMPRISES EXTRACTING THE FLUID REACTION MASS WITH AQUEOUS ALKALI-METAL HYDROXIDE, REMOVING THE AQUEOUS PHASE, EXTRACTING THE RESIDUAL ORGANIC PHASE WITH WATER, AT LEAST ONCE, AGAIN REMOVING THE AQUEOUS PHASE, AND EVENTUALLY STEAM DISTILLING THE RESIDUAL ORGANIC PHASE UNTIL ALL THE TRICHLOROBENZENE HAS BEEN DISTILLED OVER.
References Cited (Backward Citations)
US2485168A
Cited
US2471794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |