US2528928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted nitro malonic esters
Assignee: Pharmacia and Upjohn Co
•
Filing: 1947-10-02
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Granted: 1950-11-07
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Expires: 1967-10-02
Abstract
No abstract record available.
Inventors
- 👤 David I Weisblat
- 👤 Douglas A Lyttle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:28
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/04; C07D209/10; C07D209/18; C07D209/20; C07C; C07C69/00; C07C69/34; C07C69/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
AN ALKYL ALPHA - NITRO - ALPHA - CARBALKOXYBELA- (3 - INDOLE) - PROPIONATE.
Claim 2
Dependent Claim
14 words
AN ALKYL ALPHA - NITRO - ALPHA - CARBALKOXYBELA- (3 - INDOLE) - PROPIONATE.
Claim 3
Independent Claim
43 words
THE METHOD WHICH INCLUDES: ALKYLATING AN ESTER OF NITROMALONIC ACID CONTAINING UP TO AND INLCUDING 8 CARBON ATOMS IN THE ESTERIFYING GROUPS, WITH A BETA-METHYLINDOLEATING AGENT TO PRODUCE A DIESTER OF ALPHA-NITRO-ALPHA-CARBOXYBETA (3-INDOLE)-PROPIONIC ACID, DECARBALKOXYLATING THE DIESTER TO AN ESTER OF ALPHA-NITRO-BETA(3-INDOLE)-PROPIONIC ACID.
Claim 4
Independent Claim
43 words
THE METHOD WHICH INCLUDES: ALKYLATING AN ESTER OF NITROMALONIC ACID CONTAINING UP TO AND INLCUDING 8 CARBON ATOMS IN THE ESTERIFYING GROUPS, WITH A BETA-METHYLINDOLEATING AGENT TO PRODUCE A DIESTER OF ALPHA-NITRO-ALPHA-CARBOXYBETA (3-INDOLE)-PROPIONIC ACID, DECARBALKOXYLATING THE DIESTER TO AN ESTER OF ALPHA-NITRO-BETA(3-INDOLE)-PROPIONIC ACID.
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) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |