US2447762A
Expired / Lapsed
US
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Organic cation exchange adsorbents prepared from spent alkylation sulfuric acid or similar material
Assignee: Atlantic Richfield Co
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Filing: 1943-10-20
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Granted: 1948-08-24
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Expires: 1963-10-20
Abstract
No abstract record available.
Inventors
- 👤 Stephen J Macuga
- 👤 Frank G Ciapetta
- 👤 Randall G Helligmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:14
CPC Classifications
C; C13; C13B; C13B20/00; C13B20/14; C13B20/144; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/20; B01J39/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2139394A
Cited
US2291226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |