US2775622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2, 2-dimethylol-1, 5-dihydroxypentane and derivatives thereof
Assignee: Heyden Chemical Corp
•
Filing: 1951-03-27
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Granted: 1956-12-25
•
Expires: 1971-03-27
Abstract
No abstract record available.
Inventors
- 👤 John E Snow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:35
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C07; C07C; C07C29/00; C07C29/36; C07C29/38; C07C31/00; C07C31/18; C07C31/24; C07C41/00; C07C41/01; C07C41/02; C07C41/03; C07C45/00; C07C45/56; C07C45/57; C07C45/60; C08G6/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
1 words
2,2-DIMETHYLOL-1,5-DIHYDROXYPENTANE.
Claim 2
Dependent Claim
1 words
2,2-DIMETHYLOL-1,5-DIHYDROXYPENTANE.
Claim 3
Dependent Claim
35 words
A PROCESS FOR THE PREPARATION OF 2,2-DIMETHYLOL-1,5DIHYDROXYPENTANE WHICH COMPRISES REACTING AN AQUEOUS SOLUTION OF FORMALDEHYDE AND $-HYDROXYVALERALDEHYDE IN THE PRESENCE OF AN ALKALINE CONDENSING AGENT AND THEN RECOVERING THE DESIRED PRODUCT FROM THE REACTION MIXTURE.
Claim 4
Dependent Claim
35 words
A PROCESS FOR THE PREPARATION OF 2,2-DIMETHYLOL-1,5DIHYDROXYPENTANE WHICH COMPRISES REACTING AN AQUEOUS SOLUTION OF FORMALDEHYDE AND $-HYDROXYVALERALDEHYDE IN THE PRESENCE OF AN ALKALINE CONDENSING AGENT AND THEN RECOVERING THE DESIRED PRODUCT FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |