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Patent US2686184A successfully refreshed from Google Patents.
US2686184A
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Process for the manufacture of metal-free phthalocyanine of the beta-modification
Assignee: BASF Schweiz AG
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Filing: 1952-02-04
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Granted: 1954-08-10
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Expires: 1972-02-04
Abstract
No abstract record available.
Inventors
- 👤 Wettstein Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:57
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0032; C09B47/00; C09B47/04; C09B47/30; C09B47/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A PROCESS FOR THE MANUFACTURE OF THE METAL FREE PHTHALOCYANINE OF THE B-MODIFICATION COMPRISING HEATING AN ALKALI PHTHALOCYANINE THE ALKALI METAL OF WHICH HAS AN ATOMIC WEIGHT ABOVE 20 AT A TEMPERATURE WITHIN THE RANGE OF 100 TO 200* C. WITH AN AMMONIUM SALT OF A STRONG ACID.
Claim 2
Dependent Claim
48 words
A PROCESS FOR THE MANUFACTURE OF THE METAL FREE PHTHALOCYANINE OF THE B-MODIFICATION COMPRISING HEATING AN ALKALI PHTHALOCYANINE THE ALKALI METAL OF WHICH HAS AN ATOMIC WEIGHT ABOVE 20 AT A TEMPERATURE WITHIN THE RANGE OF 100 TO 200* C. WITH AN AMMONIUM SALT OF A STRONG ACID.
References Cited (Backward Citations)
US2214454A
Cited
US2485168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |