US2662914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha, alpha-vitamin a diacid and synthesis of isoprenic polyenes
Assignee: Eastman Kodak Co
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Filing: 1950-04-22
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Granted: 1953-12-15
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Expires: 1970-04-22
Abstract
No abstract record available.
Inventors
- 👤 Charles D Robeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:03
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/06; C07C403/08; C07C403/20; C07C51/00; C07C51/347; C07C51/377; C07C51/38; C07C57/00; C07C57/02; C07C57/03; C07C57/30; C07C57/42; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
AS A NEW CHEMICAL COMPOUND, A,A-VITAMIN A DIACID OF THE FORMULA
Claim 2
Dependent Claim
11 words
AS A NEW CHEMICAL COMPOUND, A,A-VITAMIN A DIACID OF THE FORMULA
Claim 3
Independent Claim
57 words
THE METHOD OF MAKING A B-METHYL-1,4-DIENE A,A-DICARBOXYLATE WHICH COMPRISES CONDENSING AN ALDEHYDE WITH AN ISOPROPYLIDENE MALONATE DIESTER IN THE PRESENCE OF A BASIC CONDENSTATION CATALYST, SAID ALDEHYDE CONTAINING 2 TO 15 CARBON ATOMS AND BUT A SINGLE CARBONYL GROUP, SAID ALDEHYDE CONSISTING SOLELY OF CARBON AND HYDROGEN EXCEPT FOR THE SINGLE OXO OXYGEN OF SAID CARBONYL GROUP.
Claim 4
Independent Claim
57 words
THE METHOD OF MAKING A B-METHYL-1,4-DIENE A,A-DICARBOXYLATE WHICH COMPRISES CONDENSING AN ALDEHYDE WITH AN ISOPROPYLIDENE MALONATE DIESTER IN THE PRESENCE OF A BASIC CONDENSTATION CATALYST, SAID ALDEHYDE CONTAINING 2 TO 15 CARBON ATOMS AND BUT A SINGLE CARBONYL GROUP, SAID ALDEHYDE CONSISTING SOLELY OF CARBON AND HYDROGEN EXCEPT FOR THE SINGLE OXO OXYGEN OF SAID CARBONYL GROUP.
References Cited (Backward Citations)
US2381882A
Cited
US2515595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |