US2793235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of glycols from polyester production
Assignee: EIDP Inc
•
Filing: 1954-09-27
•
Granted: 1957-05-21
•
Expires: 1974-09-27
Abstract
No abstract record available.
Inventors
- 👤 Hugh R Jenkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:11
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
IN THE PROCESS FOR THE CONVERSION OF A GLYCOL VAPOR CONTAINING ESTERS TO A SUBSTANTIALLY ESTER-FREE GLYCOL IN LIQUID FORM THE IMPROVEMENT WHICH COMPRISES THE STEP OF CONDENSING THE SAID VAPOR AND SAPONIFYING THE SAID ESTERS IN THE PRESENCE OF A SUBSTANTIALLY ANHYDROUS ALKALINE MATERIAL.
Claim 2
Dependent Claim
45 words
IN THE PROCESS FOR THE CONVERSION OF A GLYCOL VAPOR CONTAINING ESTERS TO A SUBSTANTIALLY ESTER-FREE GLYCOL IN LIQUID FORM THE IMPROVEMENT WHICH COMPRISES THE STEP OF CONDENSING THE SAID VAPOR AND SAPONIFYING THE SAID ESTERS IN THE PRESENCE OF A SUBSTANTIALLY ANHYDROUS ALKALINE MATERIAL.
References Cited (Backward Citations)
US2508911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-20 | 1960-11-19 | 1961-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-20 | 1964-11-19 | 1965-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-20 | 1968-11-19 | 1969-05-21 | $7700.00 | Window Closed / Lapsed |