Patent US2525247A successfully refreshed from Google Patents.
US2525247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cation exchange resins
Assignee: Wyeth Holdings LLC
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Filing: 1946-03-05
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Granted: 1950-10-10
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Expires: 1966-03-05
Abstract
No abstract record available.
Inventors
- 👤 Jack T Thurston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:01
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS WHICH COMPRISES SUSPENDING GRANULAR, CURED ACID RESINIFIED FURFURAL HAVING NO CATION EXCHANGE ACTIVITY IN A HIGHLY HALOGENATED LIQUID ALIPHATIC HYDROCARBON, TREATING SAID SUSPENSION WITH A STRONG SULFONATING AGENT UNTIL CATION EXCHANGE ACTIVITY IS IMPARTED TO THE RESIN, AND COMMINUTING THE RESIN SO OBTAINED.
Claim 2
Dependent Claim
45 words
A PROCESS WHICH COMPRISES SUSPENDING GRANULAR, CURED ACID RESINIFIED FURFURAL HAVING NO CATION EXCHANGE ACTIVITY IN A HIGHLY HALOGENATED LIQUID ALIPHATIC HYDROCARBON, TREATING SAID SUSPENSION WITH A STRONG SULFONATING AGENT UNTIL CATION EXCHANGE ACTIVITY IS IMPARTED TO THE RESIN, AND COMMINUTING THE RESIN SO OBTAINED.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |