Patent US2819309A successfully refreshed from Google Patents.
US2819309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of vitamin a amine
Assignee: Nopco Chemical Co
•
Filing: 1955-11-04
•
Granted: 1958-01-07
•
Expires: 1975-11-04
Abstract
No abstract record available.
Inventors
- 👤 Howard C Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:05
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/18; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A PROCESS FOR PRODUCING VITAMIN A AMINE WHICH COMPRISES HEATING IN THE PRESENCE OF AN INERT SOLVENT FROM ONE TO FIVE PARTS BY WEIGHT OF ALUMINUM ISOPROPOXIDE WITH ONE PART BY WEIGHT OF AN ORGANIC COMPOUND HAVING THE FOLLOWING CHARACTERISTIC: (1) AN ABSORPTION MAXIMUM IN THE ULTRA-VIOLET AT 3250 A. WITH AN EXTINCTION COEFFICIENT AT THAT WAVE LENGTH OF ABOUT 1000, (2) WHEN TREATED WITH HYDROBROMIC ACID GIVES A PRODUCT HAVING AN ABSORPTION MAXIMUM IN THE ULTRA-VIOLET AT 3300 A., (3) WHEN TREATED WITH PHOSPHORIC ACID GIVES A PRODUCT HAVING AN ABSORPTION MAXIMUM IN THE ULTRA-VIOLET OF 3280-3300 A., (4) HAS A KJELDAHL NITROGEN CONTENT OF 9.6%, (5) WHEN TREATED WITH ACETIC ANHYDRIDE GIVES A PRODUCT, THE INFRA-RED SPECTROGRAPHIC CURVE OF WHICH CONTAINS AN AMIDE BAND, (6) WHEN TREATED WITH IODINE IS CONVERTED TO VITAMIN A ALDEHYDE, (7) HAS THE VITAMIN A CHROMOPHORIC SYSTEM, (8) HAS A BASIC FRAGMENT SIMILAR TO A MAJOR PORTION OF THE HEXAMETHYLENE TETRAMINE MOLECULE, AND (9) HAS A VITAMIN A ACTIVITY OF APPROXIMATEYL 50% WHEN TESTED BIOLOGICALLY.
Claim 2
Dependent Claim
172 words
A PROCESS FOR PRODUCING VITAMIN A AMINE WHICH COMPRISES HEATING IN THE PRESENCE OF AN INERT SOLVENT FROM ONE TO FIVE PARTS BY WEIGHT OF ALUMINUM ISOPROPOXIDE WITH ONE PART BY WEIGHT OF AN ORGANIC COMPOUND HAVING THE FOLLOWING CHARACTERISTIC: (1) AN ABSORPTION MAXIMUM IN THE ULTRA-VIOLET AT 3250 A. WITH AN EXTINCTION COEFFICIENT AT THAT WAVE LENGTH OF ABOUT 1000, (2) WHEN TREATED WITH HYDROBROMIC ACID GIVES A PRODUCT HAVING AN ABSORPTION MAXIMUM IN THE ULTRA-VIOLET AT 3300 A., (3) WHEN TREATED WITH PHOSPHORIC ACID GIVES A PRODUCT HAVING AN ABSORPTION MAXIMUM IN THE ULTRA-VIOLET OF 3280-3300 A., (4) HAS A KJELDAHL NITROGEN CONTENT OF 9.6%, (5) WHEN TREATED WITH ACETIC ANHYDRIDE GIVES A PRODUCT, THE INFRA-RED SPECTROGRAPHIC CURVE OF WHICH CONTAINS AN AMIDE BAND, (6) WHEN TREATED WITH IODINE IS CONVERTED TO VITAMIN A ALDEHYDE, (7) HAS THE VITAMIN A CHROMOPHORIC SYSTEM, (8) HAS A BASIC FRAGMENT SIMILAR TO A MAJOR PORTION OF THE HEXAMETHYLENE TETRAMINE MOLECULE, AND (9) HAS A VITAMIN A ACTIVITY OF APPROXIMATEYL 50% WHEN TESTED BIOLOGICALLY.
References Cited (Backward Citations)
US2415834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |