US2905598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of acrylic acid esters
Assignee: BASF SE
•
Filing: 1958-06-13
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Granted: 1959-09-22
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Expires: 1978-06-13
Abstract
No abstract record available.
Inventors
- 👤 Allmang Helmut Zinke
- 👤 Otto Leichtle
- 👤 Von Georg Bank
- 👤 Rudolf Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:46
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A PROCESS FOR PURIFYING A CRUDE ACRYLIC ACID ESTER CONTAINING SMALL AMOUNTS OF IMPURITIES SELECTED FROM THE GROUP CONSISTING OF OXYGEN-CONTAINING AND STRONGLY UNSATURATED ORGANIC COMPOUNDS, SAID PROCESS COMPRISING: ADDING TO THE CRUDE ESTER FROM 0.05 TO 0.5 PERCENT BY WEIGHT OF BORON TRIFLUORIDE, WITH RERENCE TO THE WEIGHT OF THE ESTER; AND DISTILLING THE SO-TREATED ESTER.
Claim 2
Dependent Claim
57 words
A PROCESS FOR PURIFYING A CRUDE ACRYLIC ACID ESTER CONTAINING SMALL AMOUNTS OF IMPURITIES SELECTED FROM THE GROUP CONSISTING OF OXYGEN-CONTAINING AND STRONGLY UNSATURATED ORGANIC COMPOUNDS, SAID PROCESS COMPRISING: ADDING TO THE CRUDE ESTER FROM 0.05 TO 0.5 PERCENT BY WEIGHT OF BORON TRIFLUORIDE, WITH RERENCE TO THE WEIGHT OF THE ESTER; AND DISTILLING THE SO-TREATED ESTER.
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) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |