US3792571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for purifying waste gas
Assignee: Resonac Holdings Corp
•
Filing: 1971-04-02
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Granted: 1974-02-19
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Expires: 1991-04-02
Abstract
Abstract Purification of a gas is accomplished by passing the gas through a packed bed having an adsorbent deposited thereon and means are provided for cleaning the bed and depositing fresh absorbent thereon.
Inventors
- 👤 K Waki
- 👤 T Suzuki
- 👤 T Mitsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:01
CPC Classifications
B; B01; B01D; B01D47/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
24 words
The method of claim 1 wherein said removing of degraded adsorbent by washing is by spraying water prior to again spraying said adsorbing solution.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |