US2681348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leuco-calcium phthalocyanine and process of making the same
Assignee: EIDP Inc
•
Filing: 1952-05-24
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Granted: 1954-06-15
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Expires: 1972-05-24
Abstract
No abstract record available.
Inventors
- 👤 Robert A Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:31
CPC Classifications
C; C09; C09B; C09B47/00; C09B47/04; C09B47/30; C09B47/305; C09B47/06; C09B47/067; C09B47/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
THE ALCOHOL-SOLUBLE COMPLEX COMPOUND OBTAINED BY REACTING, IN AN ALCOHOLIC SOLVENT AND AT A TEMPERATURE BETWEEN 65* AND 100* C., PHTHALONITRILE, AMMONIA AND A CALCIUM COMPOUND OF THE GROUP CONSISTING OF CALCIUM OXIDE AND HYDROXIDE, SAID COMPLEX COMPOUND BEING CHARACTERIZED BY YIELDING METAL-FREE PHTHALOCYANINE UPON REDUCTION WITH ASCORBIC ACID.
Claim 2
Dependent Claim
49 words
THE ALCOHOL-SOLUBLE COMPLEX COMPOUND OBTAINED BY REACTING, IN AN ALCOHOLIC SOLVENT AND AT A TEMPERATURE BETWEEN 65* AND 100* C., PHTHALONITRILE, AMMONIA AND A CALCIUM COMPOUND OF THE GROUP CONSISTING OF CALCIUM OXIDE AND HYDROXIDE, SAID COMPLEX COMPOUND BEING CHARACTERIZED BY YIELDING METAL-FREE PHTHALOCYANINE UPON REDUCTION WITH ASCORBIC ACID.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |