Patent US3675392A successfully refreshed from Google Patents.
US3675392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adsorption-desorption method for purifying sf{11
Assignee: ABB Inc USA
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Filing: 1970-01-30
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Granted: 1972-07-11
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Expires: 1990-01-30
Abstract
Abstract A clear, transparent container is filled with a molecular sieve of 10 angstrom pore size. A vacuum is drawn on the interior of the container to extract purified SF6 therefrom. Contaminated SF6 is then loaded into the evacuated sieve for the next purifying cycle. A light gas exhaust valve is provided at the top of the container. When the sieve is loaded with moisture and contaminants, the molecular sieve material is replaced.
Inventors
- 👤 David H Reighter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:21
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/53; H01H33/56; C; C01; C01B; C01B17/00; C01B17/45; C01B17/4507; C01B17/4515; C01B17/453
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
The process of claim 1, wherein said process is continued until said molecular sieve is substantially filled with water and contamination products.
Claim 2
Dependent Claim
42 words
The process of claim 1, wherein, after filling said container with said contaminated sulfur hexafluoride, the top of said container is vented until the container pressure is reduced from about 1 to 5 pounds to exhaust relatively light gases from said container.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |