US3770388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Granular bed filter reactor
Assignee: Individual
•
Filing: 1971-05-24
•
Granted: 1973-11-06
•
Expires: 1991-05-24
Abstract
Abstract A granular bed filter-reactor in which mechanical means are provided to limit the amount of filter media removed during a blow back operation.
Inventors
- 👤 F Zenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:22
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
54 words
A granular bed filter-reactor according to claim 1 including a plurality of spaced apart members arranged one above the other, and a plurality of screen members each extending from below the leading edge of a different one of said spaced apart members to near the trailing edge of the spaced apart member next above.
Claim 2
Dependent Claim
31 words
A granular bed filter-reactor according to claim 2 wherein said spaced apart members are perforated and the perforations are sized to prevent the passage of material from the granular bed therethrough.
Claim 3
Dependent Claim
87 words
A granular bed filter-reactor according to claim 2 wherein each screen member is provided with an element at its trailing edge disposed at an angle to the screen member and extending away from but substantially in line with the spaced apart member above said screen member, the arrangement being such that the material of said granular bed will not flow into a pocket formed by the screen member, the angularly disposed element thereof, and the spaced apart member below and to which said screen member is fastened.
Claim 4
Dependent Claim
34 words
A granular bed filter-reactor according to claim 1 wherein said screen member is disposed at an angle to the horizontal slightly greater than the angle of repose of the material in the granular bed.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |