Patent US2780301A successfully refreshed from Google Patents.
Patent US2607805A successfully refreshed from Google Patents.
US2607805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of glycolic acid to ethylene glycol
Assignee: EIDP Inc
•
Filing: 1949-06-10
•
Granted: 1952-08-19
•
Expires: 1969-06-10
Abstract
No abstract record available.
Inventors
- 👤 William F Gresham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:21
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/132; C07C29/136; C07C29/147; C07C29/149; C12; C12C; C12C11/00; C12C11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
IN A PROCESS FOR THE HYDROGENATION OF GLYCOLIC ACID TO ETHYLENT GLYCOL IN WHICH A SUBSTANTIALLY QUANTITATIVE CONVERSION OF GLYCOLIC ACID IS OBTAINED, THE STEP WHICH COMPRISES HYDROGENATING THE GLYCOLIC ACID WHILE IN DIRECT CONTACT WITH RUTHENIUM AS THE HYDROGENATION CATALYST AT A TEMPERATURE BETWEEN 125 AND 180* C. AND UNDER A PRESSURE IN EXCESS OF ATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
58 words
IN A PROCESS FOR THE HYDROGENATION OF GLYCOLIC ACID TO ETHYLENT GLYCOL IN WHICH A SUBSTANTIALLY QUANTITATIVE CONVERSION OF GLYCOLIC ACID IS OBTAINED, THE STEP WHICH COMPRISES HYDROGENATING THE GLYCOLIC ACID WHILE IN DIRECT CONTACT WITH RUTHENIUM AS THE HYDROGENATION CATALYST AT A TEMPERATURE BETWEEN 125 AND 180* C. AND UNDER A PRESSURE IN EXCESS OF ATMOSPHERIC PRESSURE.
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) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |