US3245884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of polyethlene glycols
Assignee: Union Carbide Canada Ltd
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Filing: 1961-12-28
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Granted: 1966-04-12
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Expires: 1981-12-28
Abstract
No abstract record available.
Inventors
- 👤 Kraut Nicholas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:09
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/10; C07C43/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
PROCESS OF PURIFYING POLYETHYLENE GLYCOLS WHICH COMPRISES FRACTIONALLY DISTILLING A MIXTURE CONTAINING COLORED IMPURITIES, ETHYLENE GLYCOL AND AT LEAST ONE POLYETHYLENE GLYCOL OF THE FORMULA:
Claim 2
Dependent Claim
25 words
PROCESS OF PURIFYING POLYETHYLENE GLYCOLS WHICH COMPRISES FRACTIONALLY DISTILLING A MIXTURE CONTAINING COLORED IMPURITIES, ETHYLENE GLYCOL AND AT LEAST ONE POLYETHYLENE GLYCOL OF THE FORMULA:
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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |