US2898309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anion exchange resins from epihalohydrin and polyalkylenepolyamines
Assignee: Pfaudler Permutit Inc
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Filing: 1955-11-08
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Granted: 1959-08-04
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Expires: 1975-11-08
Abstract
No abstract record available.
Inventors
- 👤 Albert H Greer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:44
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A WATER-INSOLUBLE, HIGHLY BASIC ANION EXCHANGE RESIN WHICH IS PREPARED BY A PROCESS COMPRISING QUATERNIZING SPHEROIDALLY-SHAPED, SOLID BEADS OF A CONDENSATE OF AN EPIHALOHYDRIN AND A LOWER POLYALKYLENEPOLYAMINE WITH A METHYL HALIDE, SAID RESIN BEADS HAVING A PARTICLE SIZE OF BETWEEN ABOUT 10 AND 60 MESH ON THE U.S STANDARD SIEVE SERIES.
Claim 2
Dependent Claim
52 words
A WATER-INSOLUBLE, HIGHLY BASIC ANION EXCHANGE RESIN WHICH IS PREPARED BY A PROCESS COMPRISING QUATERNIZING SPHEROIDALLY-SHAPED, SOLID BEADS OF A CONDENSATE OF AN EPIHALOHYDRIN AND A LOWER POLYALKYLENEPOLYAMINE WITH A METHYL HALIDE, SAID RESIN BEADS HAVING A PARTICLE SIZE OF BETWEEN ABOUT 10 AND 60 MESH ON THE U.S STANDARD SIEVE SERIES.
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) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |