US2852570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyhydric
Assignee: —
•
Filing: —
•
Granted: 1958-09-16
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Expires: 1975-09-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:49
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/17; C07C29/172; B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/755; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868; C07C29/60; C07C31/00; C07C31/18; C07C31/20; C07C31/202; C07C31/205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A PROCESS FOR PREPARING 1,3-PROPYLENE GLYCOL AND GLYCEROL PLUS ETHYLENE GLYCOL BY HYDROGENATION CLEAVAGE OF HEXITOLS IN THE PRESENCE OF CATALYSTS AT ELEVATED PRESSURES AND TEMPERATURES, WHICH COMPRISES EFFECTING THE HYDROGENATION CLEVAGE IN THE PRESENCE OF CATALYSIS SELECTED FROM THE GROUP CONSISTING OF MIXTURES OF NICKEL, COPPER AND COBALT; COPPER CHROMITE AND SILVER; COPPER AND NICKEL; COBALT AND NICKEL, AT TEMPERATURES OF 180220*C. AND AT PRESSURES OF 100-200 ATMOSPHERES; THE 1.3 PROPYLENE GLYCOL BEING SELECTIVELY PRODUCED AT TEMPERATURES BETWEEN 190-220*C. AND AT PRESSURES OF 100-200 ATMOSPHERE, THE CATALYST BEING SELECTED FROM THE GROUP CONSISTING OF MIXTURES OF NICKEL, COPPER AND COBALT; COPPER CHROMITE AND SILVER; COPPER AND NICKEL; THE GLYCEROL PLUS ETHYLENE GLYCOL BEING SELECTIVELY PRODUCED AT TEMPERATURES BETWEEN 200 AND 220*C., THE CATALYST BEING SELECTED FROM THE GROUP CONSISTING OF MIXTURES OF COBALT AND NICKEL.
Claim 2
Dependent Claim
136 words
A PROCESS FOR PREPARING 1,3-PROPYLENE GLYCOL AND GLYCEROL PLUS ETHYLENE GLYCOL BY HYDROGENATION CLEAVAGE OF HEXITOLS IN THE PRESENCE OF CATALYSTS AT ELEVATED PRESSURES AND TEMPERATURES, WHICH COMPRISES EFFECTING THE HYDROGENATION CLEVAGE IN THE PRESENCE OF CATALYSIS SELECTED FROM THE GROUP CONSISTING OF MIXTURES OF NICKEL, COPPER AND COBALT; COPPER CHROMITE AND SILVER; COPPER AND NICKEL; COBALT AND NICKEL, AT TEMPERATURES OF 180220*C. AND AT PRESSURES OF 100-200 ATMOSPHERES; THE 1.3 PROPYLENE GLYCOL BEING SELECTIVELY PRODUCED AT TEMPERATURES BETWEEN 190-220*C. AND AT PRESSURES OF 100-200 ATMOSPHERE, THE CATALYST BEING SELECTED FROM THE GROUP CONSISTING OF MIXTURES OF NICKEL, COPPER AND COBALT; COPPER CHROMITE AND SILVER; COPPER AND NICKEL; THE GLYCEROL PLUS ETHYLENE GLYCOL BEING SELECTIVELY PRODUCED AT TEMPERATURES BETWEEN 200 AND 220*C., THE CATALYST BEING SELECTED FROM THE GROUP CONSISTING OF MIXTURES OF COBALT AND NICKEL.
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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |