US2768978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for making 1, 5-pentanediol from tetrahydrofurfuryl alcohol
Assignee: EIDP Inc
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Filing: 1952-08-28
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Granted: 1956-10-30
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Expires: 1972-08-28
Abstract
No abstract record available.
Inventors
- 👤 James A Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:55
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THE METHOD OF PRODUCING 1,5-PENTANEDIOL IN THE SUBSTANTIAL ABSENCE OF TETRAHYDROPYRAN WHICH COMPRISES SIMULTANEOUSLY AND CONTINUOUSLY PASSING HYDROGEN UNDER SUPERATMOSPHERIC PRESSURE AND TETRAHYDROFURFURYL ALCOHOL THROUGH A CATALYST BED FORMED OF COPPER CHROMITE PELLETS WITH A CUO:CR2O3 RATIO OF FROM 40:60 TO 85:15 AT A TEMPERATURE BETWEEN 250* AND 300* C., SAID PELLETS CONTAINING A SODIUM SILICATE BINDER.
Claim 2
Independent Claim
57 words
THE METHOD OF PRODUCING 1,5-PENTANEDIOL IN THE SUBSTANTIAL ABSENCE OF TETRAHYDROPYRAN WHICH COMPRISES SIMULTANEOUSLY AND CONTINUOUSLY PASSING HYDROGEN UNDER SUPERATMOSPHERIC PRESSURE AND TETRAHYDROFURFURYL ALCOHOL THROUGH A CATALYST BED FORMED OF COPPER CHROMITE PELLETS WITH A CUO:CR2O3 RATIO OF FROM 40:60 TO 85:15 AT A TEMPERATURE BETWEEN 250* AND 300* C., SAID PELLETS CONTAINING A SODIUM SILICATE BINDER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |