US2546938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange resins and process of treating a solution of an acid in a liquid ionizing medium to remove anions
Assignee: Dow Chemical Co
•
Filing: 1946-05-23
•
Granted: 1951-03-27
•
Expires: 1966-05-23
Abstract
No abstract record available.
Inventors
- 👤 William C Bauman
- 👤 Heusted George Beal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:59
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A SOLID RESINOUS CONDENSATION PRODUCT FORMED BY REACTING TOGETHER, IN THE PRESENCE OF AN IONIZING SOLVENT AND AT TEMPERATURES BETWEEN ABOUT 70* AND ABOUT 100* C., 1 MOLECULAR EQUIVALENT OF A MONOHYDRIC PHENOL WHICH, OF ITSELF, IS FREE OF SUBSTITUENTS IN AT LEAST TWO OF THE POSITIONS ORTHO AND PARA TO THE HYDROXYL GROUP, BETWEEN 2 AND 3.5 MOLECULAR EQUIVALENTS OF FORMALDEHYDE, AND BOTH AN AMMONIA SOURCE-MATERIAL AND A MEMBER OF THE CLASS CONSISTING OF ALKYLENEPOLYAMINES AND POLYALKYLENE-POLYAMINES IN AMOUNTS SUCH AS TO CONTAIN A TOTAL OF BETWEEN 0.5
Claim 2
Dependent Claim
89 words
A SOLID RESINOUS CONDENSATION PRODUCT FORMED BY REACTING TOGETHER, IN THE PRESENCE OF AN IONIZING SOLVENT AND AT TEMPERATURES BETWEEN ABOUT 70* AND ABOUT 100* C., 1 MOLECULAR EQUIVALENT OF A MONOHYDRIC PHENOL WHICH, OF ITSELF, IS FREE OF SUBSTITUENTS IN AT LEAST TWO OF THE POSITIONS ORTHO AND PARA TO THE HYDROXYL GROUP, BETWEEN 2 AND 3.5 MOLECULAR EQUIVALENTS OF FORMALDEHYDE, AND BOTH AN AMMONIA SOURCE-MATERIAL AND A MEMBER OF THE CLASS CONSISTING OF ALKYLENEPOLYAMINES AND POLYALKYLENE-POLYAMINES IN AMOUNTS SUCH AS TO CONTAIN A TOTAL OF BETWEEN 0.5
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) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |