US2865822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for deionizing aqueous pentaerythritol solutions
Assignee: WARREN PETROLEUM Corp Inc
•
Filing: 1956-04-30
•
Granted: 1958-12-23
•
Expires: 1976-04-30
Abstract
No abstract record available.
Inventors
- 👤 Clarence R Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:46
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01J; B01J47/00; B01J47/12; C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C12; C12C; C12C11/00; C12C11/02; B01D2311/00; B01D2311/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A METHOD OF DEIONIZING AN AQUEOUS PENTAERYTHRITOL SOLUTION CONTAINING SODIUM FORMATE AS IMPURITY WHICH COMPRISES ELECTRODIALYZING SUCH PENTAERYTHRITOL SOLUTION IN A DISSOCIATION ZONE BETWEEN ANION AND CATION EXCHANGE MEMBRANES WITH DIRECT CURRENT, WHILE MAINTAINING THE PH OF SUCH SOLUT ION BELOW ABOUT 8 BY ADDING FORMIC ACID THERETO IN ORDER TO INHIBIT DEGRADATION OF SAID PENTAERYTHRITOL, TO TRANSPORT FORMIC ACID IONS FROM SAID ZONE THROUGH AN ANION EXCHANGE MEMBRANE TO AN ANODE COMPARTMENT, WHEREIN FORMIC ACID IS OBTAINED AND TO TRANSPORT SODIUM IONS AWAY FROM SAID ZONE THROUGH A CATION EXCHANGE MEMBRANE TO A CATHODE COM-
Claim 2
Independent Claim
96 words
A METHOD OF DEIONIZING AN AQUEOUS PENTAERYTHRITOL SOLUTION CONTAINING SODIUM FORMATE AS IMPURITY WHICH COMPRISES ELECTRODIALYZING SUCH PENTAERYTHRITOL SOLUTION IN A DISSOCIATION ZONE BETWEEN ANION AND CATION EXCHANGE MEMBRANES WITH DIRECT CURRENT, WHILE MAINTAINING THE PH OF SUCH SOLUT ION BELOW ABOUT 8 BY ADDING FORMIC ACID THERETO IN ORDER TO INHIBIT DEGRADATION OF SAID PENTAERYTHRITOL, TO TRANSPORT FORMIC ACID IONS FROM SAID ZONE THROUGH AN ANION EXCHANGE MEMBRANE TO AN ANODE COMPARTMENT, WHEREIN FORMIC ACID IS OBTAINED AND TO TRANSPORT SODIUM IONS AWAY FROM SAID ZONE THROUGH A CATION EXCHANGE MEMBRANE TO A CATHODE COM-
References Cited (Backward Citations)
US1690363A
Cited
US2153507A
Cited
US1972561A
Cited
US2111360A
Cited
US2521247A
Cited
US2463610A
Cited
GB682703A
Cited
US2636852A
Cited
US2751335A
Cited
US2694680A
Cited
US2802344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |