Patent USRE27117E successfully refreshed from Google Patents.
USRE27117E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal free tothalocyanine in the new x-porm
Assignee: —
•
Filing: 1968-06-10
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Granted: 1971-04-20
•
Expires: 1988-06-10
Abstract
Abstract A NEW POLYMORPHIC FORM OF METAL-FREE PHTHALOCYANINE IS DISCLOSED. THIS POLYMORPH, REFERRED TO AS THE "X-FORM," IS IDENTIFIED BY X-RAY AND INFRARED SPECTRA. SEVERAL METHODS OF PREPARING THE X-FORM OF METAL-FREE PHTHALOCYANINE ARE DISCLOSED.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:22
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0025; C09B67/0026; C09B47/00; C09B47/04; C09B47/30
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |