Patent US3032587A successfully refreshed from Google Patents.
US3032587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of n-alkyl-1,1 dihydroheptafluorobutylamines
Assignee: Individual
•
Filing: 1956-03-22
•
Granted: 1962-05-01
•
Expires: 1976-03-22
Abstract
No abstract record available.
Inventors
- 👤 Halpern Benjamin David
- 👤 Karo Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:59
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/50; C07C211/00; C07C211/01; C07C211/02; C07C211/03; C07C211/08; C07C231/00; C07C231/02; C07C253/00; C07C253/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A PROCESS FOR PREPARING A GOOD YIELD OF N-ALKYL 1,1 DIHYDROHEPTAFLUOROBUTYLAMINE FREE FROM UNDESIRABLE BYPRODUCTS, COMPRISING THE STEPS OF ADDING A SOLUTION OF NALKYLPERFLUOROBUTYRAMIDE IN ORGANIC SOLVENT TO AN EXCESS OF LITHIUM ALUMINUM HYDRIDE DISSOLVED IN AN ORGANIC SOLVENT AND MAINTAINED AT ICE BATH TEMPERATURE AT SUCH A RATE THAT THE VIGOROUSNESS OF THE REACTION DOES NOT EXCEED REFLUX WHERE THE SOLVENT IS ETHER, SAID ALKYL GROUP BEING SELECTED FROM THE GROUP CONSISTING OF METHYL, ETHYL, N-BUTYL, AND ISOBUTYL, ALLOWING SAID RESULTING SOLUTION TO STAND AT ROOM TEMPERATURE FOR ABOUT FIVE DAYS, ADDING ETHYL ACETATE TO DECOMPOSE THE EXCESS HYDRIDE, ADDING WATER TO FORM SOLVENT AND WATER LAYERS AND RECOVERING THE SECONDARY AMINE FROM THE SOLVENT LAYER.
Claim 2
Dependent Claim
117 words
A PROCESS FOR PREPARING A GOOD YIELD OF N-ALKYL 1,1 DIHYDROHEPTAFLUOROBUTYLAMINE FREE FROM UNDESIRABLE BYPRODUCTS, COMPRISING THE STEPS OF ADDING A SOLUTION OF NALKYLPERFLUOROBUTYRAMIDE IN ORGANIC SOLVENT TO AN EXCESS OF LITHIUM ALUMINUM HYDRIDE DISSOLVED IN AN ORGANIC SOLVENT AND MAINTAINED AT ICE BATH TEMPERATURE AT SUCH A RATE THAT THE VIGOROUSNESS OF THE REACTION DOES NOT EXCEED REFLUX WHERE THE SOLVENT IS ETHER, SAID ALKYL GROUP BEING SELECTED FROM THE GROUP CONSISTING OF METHYL, ETHYL, N-BUTYL, AND ISOBUTYL, ALLOWING SAID RESULTING SOLUTION TO STAND AT ROOM TEMPERATURE FOR ABOUT FIVE DAYS, ADDING ETHYL ACETATE TO DECOMPOSE THE EXCESS HYDRIDE, ADDING WATER TO FORM SOLVENT AND WATER LAYERS AND RECOVERING THE SECONDARY AMINE FROM THE SOLVENT LAYER.
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) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |