US2549457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alphamethylacrolein
Assignee: EIDP Inc
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Filing: 1948-08-04
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Granted: 1951-04-17
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Expires: 1968-08-04
Abstract
No abstract record available.
Inventors
- 👤 William F Gresham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:03
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/72; C07C45/75
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN A PROCESS FOR THE PREPARATION OF ALPHAMETHYLACROLEIN, THE STEPS WHICH COMPRISES GRADUALLY ADDING PROPIONALDEHYDE TO A SOLUTION OF PARAFORMALDEHYDE, WATER AND BORON TRIFLUORIDE, CONTAINING ON A MOLE RATIO BASIS FROM 2:1 TO 3.5:1 MOLES OF WATER PER MOLE OF BORON TRIFLUORIDE, HEATING SAID SOLUTION TO A TEMPERATURE BETWEEN 90 AND 125* C., WHEREBY THE PROPINALDEHYDE IS RAPIDALY REACTED WITH THE FORMALDEHYDE PRESENT, AND DISTILLING OFF THE ALPHA-METHYLACROLEIN-WATER AZEOTROPE SUBSTANTIALLY AS RAPIDLY AS FORMED
Claim 2
Dependent Claim
74 words
IN A PROCESS FOR THE PREPARATION OF ALPHAMETHYLACROLEIN, THE STEPS WHICH COMPRISES GRADUALLY ADDING PROPIONALDEHYDE TO A SOLUTION OF PARAFORMALDEHYDE, WATER AND BORON TRIFLUORIDE, CONTAINING ON A MOLE RATIO BASIS FROM 2:1 TO 3.5:1 MOLES OF WATER PER MOLE OF BORON TRIFLUORIDE, HEATING SAID SOLUTION TO A TEMPERATURE BETWEEN 90 AND 125* C., WHEREBY THE PROPINALDEHYDE IS RAPIDALY REACTED WITH THE FORMALDEHYDE PRESENT, AND DISTILLING OFF THE ALPHA-METHYLACROLEIN-WATER AZEOTROPE SUBSTANTIALLY AS RAPIDLY AS FORMED
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |