US2987550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of c14 aldehyde
Assignee: Pfizer Inc
•
Filing: 1958-09-25
•
Granted: 1961-06-06
•
Expires: 1978-09-25
Abstract
No abstract record available.
Inventors
- 👤 William E Stieg
- 👤 Jr John D Gillis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:31
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/14; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN THE DARZEN''S PROCESS FOR FORMING C14 ALDEHYDE WHICH COMPRISES (A) MIXING B-IONONE AND AN ALKYL CHLOROACETATE, THE ALKYL RADICAL OF WHICH CONTAINS 1 TO 4 CARBON ATOMS, DURING THE ADDITION OF SMALL PORTIONS OF DRY, ALCOHOL-FREE ALKALI METAL ALKOXIDE AT A LOW TEMPERATURE, (B) SUBSEQUENT TREATMENT OF REACTION MIXTURE WITH COLD METHANOLIC SODIUM HYDROXIDE AT A LOW TEMPERATURE AND (C) SUBSEQUENT RECOVERY OF C14 ALDEHYDE, THE IMPROVEMENT WHICH CONSISTS IN ADDING AN ESSENTIALLY ANHYDROUS DILUENT DURING THE MIXING OF THE B-IONONE AND THE ALKYL CHLOROACETATE, SAID DILUENT BEING SELECTED FROM THE GROUP CONSISTING OF DIMETHYL FORMAMIDE, PYRIDINE, DIMETHYLACETAMIDE, N-ETHYL-ACETAMIDE, A-PICOLINE, B-PICOLINE, AND R-PICOLINE.
Claim 2
Dependent Claim
104 words
IN THE DARZEN''S PROCESS FOR FORMING C14 ALDEHYDE WHICH COMPRISES (A) MIXING B-IONONE AND AN ALKYL CHLOROACETATE, THE ALKYL RADICAL OF WHICH CONTAINS 1 TO 4 CARBON ATOMS, DURING THE ADDITION OF SMALL PORTIONS OF DRY, ALCOHOL-FREE ALKALI METAL ALKOXIDE AT A LOW TEMPERATURE, (B) SUBSEQUENT TREATMENT OF REACTION MIXTURE WITH COLD METHANOLIC SODIUM HYDROXIDE AT A LOW TEMPERATURE AND (C) SUBSEQUENT RECOVERY OF C14 ALDEHYDE, THE IMPROVEMENT WHICH CONSISTS IN ADDING AN ESSENTIALLY ANHYDROUS DILUENT DURING THE MIXING OF THE B-IONONE AND THE ALKYL CHLOROACETATE, SAID DILUENT BEING SELECTED FROM THE GROUP CONSISTING OF DIMETHYL FORMAMIDE, PYRIDINE, DIMETHYLACETAMIDE, N-ETHYL-ACETAMIDE, A-PICOLINE, B-PICOLINE, AND R-PICOLINE.
References Cited (Backward Citations)
US2451740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |