Patent US3732275A successfully refreshed from Google Patents.
US3732275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separating phthalonitriles from reaction gases containing the same
Assignee: BASF SE
•
Filing: 1970-12-30
•
Granted: 1973-05-08
•
Expires: 1990-12-30
Abstract
Abstract AN IMPROVED PROCESS FOR THE RECOVERY OF PHTHALONITRILES FROM HOT REACTION GASES CONTAINING THE SAME BY CONTACTING THE HOT REACTION GASES WITH A COOLANT WHICH IS AT A TEMPERATURE OF FROM 40* TO 200*C. AND COOLING THEM DOWN AT A RATE OF MORE THAN 350*C. PER SECONDS, THE COOLANT BEING WATER, BENZONITRILE OR O-TOLUNITRILE WHICH FROM RRECYCLING CONTAINS 2 TO 40% PHTHALONITRILES. O-PHTHALONITRILE IS SUITABLE FOR THE PRODUCTION OF PHTHALOCYANINES WHICH ARE VALUABLE PIGMENTS, TEREPHTHALONITRILE AND ISOPHTHALONITRILES CAN BE REDUCED TO THE CORRESPONDING DIAMINES WHICH ARE STARTING MATERIALS FOR THE MANUFACTURE OF POLYAMIDES WHICH CAN BE USED FOR THE PRODUCTION OF FIBERS.
Inventors
- 👤 R Platz
- 👤 M Decker
- 👤 G Buerger
- 👤 H Stechl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:12
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |