US3393220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of high purity phthalonitriles
Assignee: Halcon Research and Development Corp
•
Filing: 1964-11-18
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Granted: 1968-07-16
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Expires: 1984-11-18
Abstract
No abstract record available.
Inventors
- 👤 Charles N Winnick
- 👤 Schlossman Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:03
CPC Classifications
C; C07; C07C; C07C255/00; C07C253/00; C07C253/24; C07C253/28; C07C51/00; C07C51/08; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40; C08G63/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-16 | 1972-01-15 | 1972-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-16 | 1976-01-15 | 1976-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-16 | 1980-01-15 | 1980-07-16 | $7700.00 | Window Closed / Lapsed |