US3066171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of crude pentaerythritol
Assignee: Celanese Canada Inc
•
Filing: 1958-11-10
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Granted: 1962-11-27
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Expires: 1978-11-10
Abstract
No abstract record available.
Inventors
- 👤 John C Chmie
- 👤 Eric L Tollefson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:31
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/18; C07C31/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
PROCESS FOR THE PURIFICATION OF CRUDE PENTAERYTHRITOL CONTAINING PENTAERYTHRITOL FORMALS, WHICH COMPRISES MAINTAINING A SOLUTION OF SAID CRUDE PENTAERYTHRITOL IN ACIDULATED WATER AT AN ELEVATED TEMPERATURE TO HYDROLYZE SAID FORMALS, THE PH OF THE SOLUTION BEING NO HIGHER THAN ABOUT 5, AND CONTACTING SAID ACIDULATED SOLUTION WITH OZONE.
Claim 2
Dependent Claim
48 words
PROCESS FOR THE PURIFICATION OF CRUDE PENTAERYTHRITOL CONTAINING PENTAERYTHRITOL FORMALS, WHICH COMPRISES MAINTAINING A SOLUTION OF SAID CRUDE PENTAERYTHRITOL IN ACIDULATED WATER AT AN ELEVATED TEMPERATURE TO HYDROLYZE SAID FORMALS, THE PH OF THE SOLUTION BEING NO HIGHER THAN ABOUT 5, AND CONTACTING SAID ACIDULATED SOLUTION WITH OZONE.
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) | 1965-11-26 | 1966-05-28 | 1966-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-26 | 1970-05-28 | 1970-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-26 | 1974-05-28 | 1974-11-27 | $7700.00 | Window Closed / Lapsed |