US3784674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atmosphere purification of radon and radon daughter elements
Assignee: United States Atomic Energy Commission
•
Filing: 1971-09-09
•
Granted: 1974-01-08
•
Expires: 1991-09-09
Abstract
Abstract A METHOD OF REMOVING RADON AND RADON DAUGHTER ELEMENTS FROM AN ATMOSPHERE CONTAINING THESE ELEMENTS BY PASSING THE ATMOSPHERE THROUGH A BED OF FLOURINATING COMPOUND WHEREBY THE RADON AND RADON DAUGHTERS ARE OXIDIZED TO THEIR RESPECTIVE FLUORIDES. THESE FLOURIDES ADHERE TO THE FLOURINATING COMPOUND AND ARE THUS REMOVED FROM THE ATMOSPHERE WHICH MAY THEN BE RECIRCULATED. A METHOD FOR RECOVERING RADON AND SEPARATING RADON FROM ITS DAUGHTER ELEMENTS IS ALSO DESCRIBED.
Inventors
- 👤 L Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:33
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/02; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; C; C01; C01B; C01B23/00; C01B23/0005; Y; Y10; Y10S; Y10S250/00; Y10S250/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |