US3827989A
Expired / Lapsed
US
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Impregnated chemical separation particles
Assignee: United States Atomic Energy Commission
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Filing: 1972-11-13
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Granted: 1974-08-06
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Expires: 1992-11-13
Abstract
Abstract PARTICLES, SUCH AS ION EXCHANGE AND SELECTIVE SORBENTS USEFUL IN CHEMICAL SEPARATION PROCESSES, HAVING A CONTINUOUS PHASE THROUGHOUT THE ENTIRE PARTICLE AND AN IMPERMEABLE IMPREGNANT IN THE CENTRAL PORTION OF THE PARTICLE, AND A METHOD FOR PRODUCING THE PARTICLE.
Inventors
- 👤 C Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:44
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28016; B01J20/28019; B01J20/30; B01J20/32; B01J20/3291; B01J20/3293; B01J47/00; B01J47/016
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |