Patent US3801591A successfully refreshed from Google Patents.
US3801591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of phthalocyanine pigment
Assignee: EIDP Inc
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Filing: 1972-06-12
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Granted: 1974-04-02
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Expires: 1992-06-12
Abstract
Abstract A METAL PHTHALOCYANINE PIGMENT COMPOSED ALMOST EXCLUSIVELY OF THE A I POLYMORPH IS PREPARED BY A PROCESS IN WHICH CRUDE METAL PHTHALOCYANINE IS SUBJECTED TO CONTROLLED PRECIPITATION IN TWO SAGES FOLLOWED BY CONDITIONING OF THE RESULTANT SLYRRY UNDER INTENSE AGITATION TO GENERATE AN AIR/LIQUID INTERFACE AND THEREBY FACILITATE FLOCCULATION, HENSE FILTRATION.
Inventors
- 👤 J Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:00
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0017; C09B67/0019; C09B67/0025; C09B67/0026
Claims Analysis
Total Claims: 0
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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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |