Patent US2529602A successfully refreshed from Google Patents.
US2529602A
Expired / Lapsed
US
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Ion exchange material and method of making the same
Assignee: Research Products Corp
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Filing: 1948-09-02
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Granted: 1950-11-14
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Expires: 1968-09-02
Abstract
No abstract record available.
Inventors
- 👤 Stanley H Frohmader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:36
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
AN ION EXCHANGE MATERIAL COMPRISING THE WATER INSOLUBLE RESINOUS REACTION PRODUCT OF FORMALDEHYDE AND NAPHTHALENE SULFONIC ACID OF WHICH ACID AT LEAST 75% IS IN THE ALPHA FORM.
Claim 2
Dependent Claim
28 words
AN ION EXCHANGE MATERIAL COMPRISING THE WATER INSOLUBLE RESINOUS REACTION PRODUCT OF FORMALDEHYDE AND NAPHTHALENE SULFONIC ACID OF WHICH ACID AT LEAST 75% IS IN THE ALPHA FORM.
References Cited (Backward Citations)
US2204539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |