US3963755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixture of 2(2'-propanal)-5-methyl-1,3-dioxane and 2(3'-propanal)-5-methyl-1,3-dioxane
Assignee: EIDP Inc
•
Filing: 1974-07-31
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Granted: 1976-06-15
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Expires: 1994-07-31
Abstract
Abstract 2(2'-PROPANAL)-5-METHYL-1,3-DIOXANE AND 2(3'-PROPANAL)-5-METHYL-1,3-DIOXANE ARE PROVIDED AS NEW CYCLIC ACETAL-ALDEHYDES WHICH, WHEN HYDROLYZED AND HYDROGENATED, PROVIDE HIGH YIELDS OF A MIXTURE OF 1,4-BUTANEDIOL AND 2-METHYL-1,3-PROPANEDIOL.
Inventors
- 👤 Charles C. Cumbo
- 👤 Kamlesh K. Bhatia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:50
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/04; C07D319/06; C07D317/00; C07D317/08; C07D317/10; C07D317/14; C07D317/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
The cyclic acetal-aldehyde mixture of 2(2'-propanal)-5-methyl-1,3-dioxane and 2(3'-propanal)-5-methyl-1,3-dioxane.
Claim 2
Dependent Claim
8 words
The cyclic acetal-aldehyde mixture of 2(2'-propanal)-5-methyl-1,3-dioxane and 2(3'-propanal)-5-methyl-1,3-dioxane.
References Cited (Backward Citations)
US2729650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |