Patent US2739170A successfully refreshed from Google Patents.
US2739170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alkylidene-bis-haloalkanoic amides
Assignee: Glanzstoff AG
•
Filing: 1954-10-07
•
Granted: 1956-03-20
•
Expires: 1974-10-07
Abstract
No abstract record available.
Inventors
- 👤 Heisenberg Erwin
- 👤 Kleine Johannes
- 👤 Lotz Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:16
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
THE METHOD OF PREPARING ALKYLIDENE-BIS-HALOALKYL AMIDES WHICH COMPRISES VAPORIZING AN UNSATURATED NITRILE OF THE CLASS CONSISTING OF LOWER ALKENYL AND CHLORO-LOWER ALKENYL NITRILES, CONTACTING SAID NITRILE WHILE IN THE VAPOR PHASE WITH THE VAPOR OF A LOWER ALKANAL, VAPOR OF THE GROUP CONSISTING OF HYDROGEN CHLORIDE AND HYDROGEN BROMIDE, AND WATER VAPOR, AT A TEMPERATURE FROM ABOUT 80* C. TO 500* C., IN THE PRESENCE OF A CATALYST SELECTED FROM THE CLASS CONSISTING OF ALUMINUM CHLORIDE, ALUMINUM OXIDE, BORON PHOSPHATE, ZINC OXIDE, CLAY SHARD, SILICA GEL, AND MIXTURES THEREOF, THE MOLAR AMOUNT OF ALKANAL RANGING FROM ABOUT 0.5 TO 3 TIMES THE MOLAR AMOUNT OF NITRILE, THE MOLAR PROPORTION OF HYDROGEN HALIDE BEING AT LEAST 1 MOL RELATIVE TO EACH MOL OF THE NITRILE, THE QUANTITY OF WATER BEING FROM TWO TO THREE TIMES THE QUANTITY OF ALKANAL, AND COLLECTING THE BIS-AMIDE.
Claim 2
Independent Claim
142 words
THE METHOD OF PREPARING ALKYLIDENE-BIS-HALOALKYL AMIDES WHICH COMPRISES VAPORIZING AN UNSATURATED NITRILE OF THE CLASS CONSISTING OF LOWER ALKENYL AND CHLORO-LOWER ALKENYL NITRILES, CONTACTING SAID NITRILE WHILE IN THE VAPOR PHASE WITH THE VAPOR OF A LOWER ALKANAL, VAPOR OF THE GROUP CONSISTING OF HYDROGEN CHLORIDE AND HYDROGEN BROMIDE, AND WATER VAPOR, AT A TEMPERATURE FROM ABOUT 80* C. TO 500* C., IN THE PRESENCE OF A CATALYST SELECTED FROM THE CLASS CONSISTING OF ALUMINUM CHLORIDE, ALUMINUM OXIDE, BORON PHOSPHATE, ZINC OXIDE, CLAY SHARD, SILICA GEL, AND MIXTURES THEREOF, THE MOLAR AMOUNT OF ALKANAL RANGING FROM ABOUT 0.5 TO 3 TIMES THE MOLAR AMOUNT OF NITRILE, THE MOLAR PROPORTION OF HYDROGEN HALIDE BEING AT LEAST 1 MOL RELATIVE TO EACH MOL OF THE NITRILE, THE QUANTITY OF WATER BEING FROM TWO TO THREE TIMES THE QUANTITY OF ALKANAL, AND COLLECTING THE BIS-AMIDE.
References Cited (Backward Citations)
US2270520A
Cited
US2338177A
Cited
FR882106A
Cited
US2475846A
Cited
US2534204A
Cited
US2576501A
Cited
US2576502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |