US2770656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ethylene glycol
Assignee: Dow Chemical Co
•
Filing: 1953-06-05
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Granted: 1956-11-13
•
Expires: 1973-06-05
Abstract
No abstract record available.
Inventors
- 👤 David J Pye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:02
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/09; C07C29/10; C07C29/103; C07C29/106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A CATALYSTIC VAPOR PHASE PROCESS FOR HYDRATING ETHYLENE OXIDE TO ETHYLENE GLYCOL WHICH COMPRISES PASSING A VAPOR PHASE MIXTURE OF WATER AND LESS THAN AN EQUINMOLECULAR PROPORTION OF ETHYLENE OXIDE OVER A CATALYST COMPRISING A NORMAL CALCIUM ORTHO PHOSPHATE AT A REACTION TEMPERATURE BELOW 500* C.
Claim 2
Dependent Claim
46 words
A CATALYSTIC VAPOR PHASE PROCESS FOR HYDRATING ETHYLENE OXIDE TO ETHYLENE GLYCOL WHICH COMPRISES PASSING A VAPOR PHASE MIXTURE OF WATER AND LESS THAN AN EQUINMOLECULAR PROPORTION OF ETHYLENE OXIDE OVER A CATALYST COMPRISING A NORMAL CALCIUM ORTHO PHOSPHATE AT A REACTION TEMPERATURE BELOW 500* C.
References Cited (Backward Citations)
US2271942A
Cited
US2367877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |