Patent US2917518A successfully refreshed from Google Patents.
US2917518A
Expired / Lapsed
US
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Acid pasting of metal-free phthalocyanine
Assignee: EIDP Inc
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Filing: 1958-07-14
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Granted: 1959-12-15
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Expires: 1978-07-14
Abstract
No abstract record available.
Inventors
- 👤 Merner Richard Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:14
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0017; C09B67/0019
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
IN THE ACID-PASTING OF METAL-FREE PHTHALOCYANINE BY DISSOLVING THE COLOR IN CONCENTRATED SULFURIC ACID AND DROWNING THE RESULTING SOLUTION IN WATER, THE IMPROVEMENT WHICH CONSISTS OF MAINTAINING IN CONTACT WITH SAID SOLUTION OF PIGMENT AN ATMOSPHERE FREE OF OXIDIZING GASES, AT ALL STAGES PRIOR TO DROWNING.
Claim 2
Dependent Claim
46 words
IN THE ACID-PASTING OF METAL-FREE PHTHALOCYANINE BY DISSOLVING THE COLOR IN CONCENTRATED SULFURIC ACID AND DROWNING THE RESULTING SOLUTION IN WATER, THE IMPROVEMENT WHICH CONSISTS OF MAINTAINING IN CONTACT WITH SAID SOLUTION OF PIGMENT AN ATMOSPHERE FREE OF OXIDIZING GASES, AT ALL STAGES PRIOR TO DROWNING.
References Cited (Backward Citations)
US2176011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |