US2862030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of vitamin a aldehyde
Assignee: Nopco Chemical Co
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Filing: 1957-08-21
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Granted: 1958-11-25
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Expires: 1977-08-21
Abstract
No abstract record available.
Inventors
- 👤 Howard C Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:53
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/06; C07C403/08; C07C403/14; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A PROCESS FOR PRODUCING AN IMINE INTERMEDIATE WHICH WHEN REACTED WITH WATER YIELDS ANHYDRO FREE VITAMIN A ALDEHYDE WHICH COMPRISES REACTING WITH IODINE, A COMPLEX OBTAINED BY REACTING AT LEAST ONE MOLE OF A BORON TRIFLUORIDE HEXAMETHYLENE TETRAMINE COMPLEX CONTAINING FROM ABOUT 1.5 TO 2.5 MOLES OF BORON TRIFLUORIDE PER MOLE OF HEXAMETHYLENE TETRAMINE AT BETWEEN ROOM TEMPERATURE AND 35*C. IN THE PRESENCE OF A SOLVENT WITH ONE MOLE OF
Claim 2
Dependent Claim
70 words
A PROCESS FOR PRODUCING AN IMINE INTERMEDIATE WHICH WHEN REACTED WITH WATER YIELDS ANHYDRO FREE VITAMIN A ALDEHYDE WHICH COMPRISES REACTING WITH IODINE, A COMPLEX OBTAINED BY REACTING AT LEAST ONE MOLE OF A BORON TRIFLUORIDE HEXAMETHYLENE TETRAMINE COMPLEX CONTAINING FROM ABOUT 1.5 TO 2.5 MOLES OF BORON TRIFLUORIDE PER MOLE OF HEXAMETHYLENE TETRAMINE AT BETWEEN ROOM TEMPERATURE AND 35*C. IN THE PRESENCE OF A SOLVENT WITH ONE MOLE OF
Claim 3
Dependent Claim
85 words
A PROCESS FOR PRODUCING ANHYDRO FREE VITAMIN A ALDEHYDE WHICH COMPRISES REACTING IN SOLUTION AT A TEMPERATURE OF BETWEEN 65*C. AND THE REFLUX TEMPERATURE OF THE MIXTURE AND IN THE PRESENCE OF A SMALL AMOUNT OF WATER, IODINE AND A COMPLEX OBTAINED BY REACTING AT LEAST ONE MOLE OF BORON TRIFLUORIDE HEXAMETHYLENE TETRAMINE COMPLEX CONTAINING FROM ABOUT 1.3 TO 2.5 MOLES OF BORON TRIFLUORIDE PER MOLE OF HEXAMETHYLENE TETRAMINE AT BETWEEN ROOM TEMPERATURE AND 35*C. IN THE PRESENCE OF A SOLVENT WITH ONE MOLE OF
Claim 4
Dependent Claim
85 words
A PROCESS FOR PRODUCING ANHYDRO FREE VITAMIN A ALDEHYDE WHICH COMPRISES REACTING IN SOLUTION AT A TEMPERATURE OF BETWEEN 65*C. AND THE REFLUX TEMPERATURE OF THE MIXTURE AND IN THE PRESENCE OF A SMALL AMOUNT OF WATER, IODINE AND A COMPLEX OBTAINED BY REACTING AT LEAST ONE MOLE OF BORON TRIFLUORIDE HEXAMETHYLENE TETRAMINE COMPLEX CONTAINING FROM ABOUT 1.3 TO 2.5 MOLES OF BORON TRIFLUORIDE PER MOLE OF HEXAMETHYLENE TETRAMINE AT BETWEEN ROOM TEMPERATURE AND 35*C. IN THE PRESENCE OF A SOLVENT WITH ONE MOLE OF
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) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |