Patent US2678941A successfully refreshed from Google Patents.
US2678941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of aromatic dinitriles
Assignee: California Research LLC
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Filing: 1953-01-02
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Granted: 1954-05-18
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Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 Louis L Ferstandig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:49
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A PROCESS FOR CONVERTING ISOPHTHALIC ACID TO ISOPHTHALONITRILE AND CONCURRENTLY SUPPRESSING THE FORMATION OF METACYANOBENZOIC ACID WHICH COMPRISES CONTACTING ISOPHTHALIC ACID WITH AMMONIA AT AN ELEVATED TEMPERATURE BELOW 310* C.
Claim 2
Dependent Claim
30 words
A PROCESS FOR CONVERTING ISOPHTHALIC ACID TO ISOPHTHALONITRILE AND CONCURRENTLY SUPPRESSING THE FORMATION OF METACYANOBENZOIC ACID WHICH COMPRISES CONTACTING ISOPHTHALIC ACID WITH AMMONIA AT AN ELEVATED TEMPERATURE BELOW 310* C.
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) | 1957-05-17 | 1957-11-16 | 1958-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-17 | 1961-11-16 | 1962-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-17 | 1965-11-16 | 1966-05-18 | $7700.00 | Window Closed / Lapsed |