Patent US3714335A successfully refreshed from Google Patents.
US3714335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing hf and nitrilotriacetonitrile
Assignee: Ethyl Corp
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Filing: 1971-01-29
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Granted: 1973-01-30
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Expires: 1991-01-29
Abstract
Abstract IT IS DISCLOSED THAT HYDROFLUORIC ACID AND NITRILOTRACETONITRILE CAN BE CO-PRODUCED FROM FLUOSILICIC ACID, AMMONIA, FORMALDEHYDE AND HYDROGEN CYANIDE. THE FLUOSILICIC ACID TYPICALLY IS USED IN A PRELIMINARY REACTION WITH AMMONIA AND WATER TO PRODUCE AMMONIUM FLUORIDE WHICH IS THEN REACTED WITH FORMALDEHYDE AND HYDROGEN CYANIDE COINCIDENTALLY OR IN SEQUENCE. THE PRODUCT HYDROFLUORIC ACID IS READILY RECOVERED BY DISTILLATION LEAVING A CO-PRODUCT AMINE NITRILE.
Inventors
- 👤 P Kobetz
- 👤 K Lindsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:46
CPC Classifications
C; C07; C07C; C07C255/00; C01; C01B; C01B7/00; C01B7/19; C01B7/191
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |