Patent US2023022A successfully refreshed from Google Patents.
Patent US3673258A successfully refreshed from Google Patents.
US3673258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 2,2,4-trimethyl-3-hydroxypentanal
Assignee: Individual
•
Filing: 1968-12-27
•
Granted: 1972-06-27
•
Expires: 1988-12-27
Abstract
Abstract Production of 2,2,4-trimethyl-3-hydroxypentanal by dimerization of isobutyraldehyde in the presence of a basic ion exchanger. The product is a valuable intermediate for the production of polyesters and plasticizers.
Inventors
- 👤 Franz Merger
- 👤 Rolf Platz
- 👤 Erich Nebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:40
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/72
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
21 words
A process as claimed in claim 1 wherein the isobutyraldehyde is contacted with a strongly basic ion exchanger containing tetraalkylammonium groups.
Claim 2
Dependent Claim
33 words
A process as claimed in claim 1 wherein the reaction is carried out batchwise using the exchanger in an amount of from 10 to 100 percent by volume with reference to starting material.
Claim 3
Dependent Claim
36 words
A process as claimed in claim 1 wherein the reaction is carried out batchwise in the presence of an exchanger in an amount of from 25 to 50 percent by volume with reference to starting material.
Claim 4
Dependent Claim
41 words
A process as claimed in claim 1 wherein the reaction is carried out continuously in the presence of from 1 to 10 percent by volume of exchanger with reference to the average amount of aldehyde passed through the exchanger per hour.
Claim 5
Dependent Claim
22 words
A process as claimed in claim 1 wherein the reaction is carried out at a temperature of from 50* to 70* C.
References Cited (Backward Citations)
US2863878A
Cited
US3077500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |