Patent US2546019A successfully refreshed from Google Patents.
US2546019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 1, 5-pentanediols
Assignee: Shell Development Co
•
Filing: 1947-10-25
•
Granted: 1951-03-20
•
Expires: 1967-10-25
Abstract
No abstract record available.
Inventors
- 👤 Curtis W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:23
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/18; C07C31/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
A METHOD OF PREPARING A 1,5-DIOL COMPRISING SUBJECTING IN THE PRESENCE OF A HYDROGENATION CATALYST A 3,4-DIHYDRO-1,2-PYRAN HAVING AN ORGANIC SUBSTITUENT GROUP ATTACHED TO THE CARBON ATOM IN POSITION NO.2 OF THE DIHYDROPYRAN RING BY A HYDROLYZABLE BOND TO A DIVALENT ATOM OF A NON-METALLIC ELEMENT OF GROUP VI OF THE PERIODIC TABLE OF THE ELEMENTS, TO THE SIMULTANEOUS ACTION OF AN AQUEOUS HYDROLYTIC MEDIUM AND HYDROGEN UNDER CONDITIONS OF AN ELEVATED TEMPERATURE AND A SUPERATMOSPHERIC PRESSURE OF HYDROGEN CONDUCIVE TO HYDROGENATION REACTION, AND RECOVERING A 1,5-DIOL FROM THE RESULTANT MIXTURE.
References Cited (Backward Citations)
US2097493A
Cited
US2440929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-19 | 1954-09-18 | 1955-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-19 | 1958-09-18 | 1959-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-19 | 1962-09-18 | 1963-03-20 | $7700.00 | Window Closed / Lapsed |