US3708293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pi-form metal-free phthalocyanine
Assignee: Xerox Corp
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Filing: 1971-05-21
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Granted: 1973-01-02
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Expires: 1991-05-21
Abstract
Abstract A NOVEL FORM OF PHTHALOCYANINE (PC), NAMELY N-FORM METAL-FREE PHTHALOCYANINE, IS DISCLOSED. METHODS FOR THE PREPARATION AND USE OF SAID PHTHALOCYANINE ARE ALSO DISCLOSED.
Inventors
- 👤 P Brach
- 👤 M Lardon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:20
CPC Classifications
C; C09; C09B; C09B47/00; C09B47/04; C09B47/30; C09B47/06; C09B47/073; C09B67/00; C09B67/0025; C09B67/0026; G; G03; G03G; G03G17/00; G03G17/04; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0696
Claims Analysis
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |