US2875249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New preparation of 2, 5-dimethylcyclopentanone
Assignee: Union Carbide Corp
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Filing: 1957-02-28
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Granted: 1959-02-24
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Expires: 1977-02-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry A Stansbury
- 👤 Howard R Guest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:25
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/45; C07C45/56; C07C45/57; C07C45/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A PROCESS WHICH COMPRISES FORMING A MIXTURE OF A MINERAL ACID OF A MINIMUM CONCENTRATION OF EIGHT PERCENT AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF 3,4 -DIHYDRO-2,5-DIMETHYL-2-FORMYL-2H-PYRAN AND 2,5-DIMETHYL-2-HYDROXYADIPALDEHYDE AND HEATING SAID MIXTURE TO CAUSETHE FORMATION OF 2,5-DIMETHYLCYCOPENTANONE.
Claim 2
Dependent Claim
40 words
A PROCESS WHICH COMPRISES FORMING A MIXTURE OF A MINERAL ACID OF A MINIMUM CONCENTRATION OF EIGHT PERCENT AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF 3,4 -DIHYDRO-2,5-DIMETHYL-2-FORMYL-2H-PYRAN AND 2,5-DIMETHYL-2-HYDROXYADIPALDEHYDE AND HEATING SAID MIXTURE TO CAUSETHE FORMATION OF 2,5-DIMETHYLCYCOPENTANONE.
References Cited (Backward Citations)
US2694077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |