Patent US3051747A successfully refreshed from Google Patents.
US3051747A
Expired / Lapsed
US
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Synthesis of acrylic acids
Assignee: Dow Chemical Co
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Filing: 1958-03-27
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Granted: 1962-08-28
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Expires: 1978-03-27
Abstract
No abstract record available.
Inventors
- 👤 Joel M Leathers
- 👤 George E Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:24
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/353
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A PROCESS FOR THE PREPARATION OF ACRYLIC ACIDS WHICH COMPRISES THE STEPS OF CONTACTING AN ALKANOIC ACID CONTAINING 2 TO 7 CARBON ATOMS AND HAVING AN ALPHA METHYLENE GROUP WITH FORMALDEHYDE IN THE PRESENCE OF A CATALYST COMPRISING AN ALKALI METAL SALT OF THE ALKANOIC ACID SUPPORTED ON AN INERT ABSORBENT BED ATA A TEMPERATURE OF FROM 300* TO 450*C., AND SEPARATING THE ACRYLIC ACID FROM REACTION EFFLUENT.
Claim 2
Dependent Claim
68 words
A PROCESS FOR THE PREPARATION OF ACRYLIC ACIDS WHICH COMPRISES THE STEPS OF CONTACTING AN ALKANOIC ACID CONTAINING 2 TO 7 CARBON ATOMS AND HAVING AN ALPHA METHYLENE GROUP WITH FORMALDEHYDE IN THE PRESENCE OF A CATALYST COMPRISING AN ALKALI METAL SALT OF THE ALKANOIC ACID SUPPORTED ON AN INERT ABSORBENT BED ATA A TEMPERATURE OF FROM 300* TO 450*C., AND SEPARATING THE ACRYLIC ACID FROM REACTION EFFLUENT.
References Cited (Backward Citations)
FR847370A
Cited
US2697729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-27 | 1966-02-26 | 1966-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-27 | 1970-02-26 | 1970-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-27 | 1974-02-26 | 1974-08-28 | $7700.00 | Window Closed / Lapsed |