US3677406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter aid slurry metering process
Assignee: Zeneca Inc
•
Filing: 1970-09-25
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Granted: 1972-07-18
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Expires: 1990-09-25
Abstract
Abstract A system for measuring the solids content on a dry basis in a filter aid water slurry and pumping the filter aid back into a filter is described herein. The system circulates the filter aid water slurry through a density gauge and flowmeter to measure the dry weight of solids therein. Then, the slurry is pumped back into the filter for reuse.
Inventors
- 👤 James A King
- 👤 David R Maxam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:20
CPC Classifications
C; C01; C01D; C01D7/00; B; B01; B01D; B01D37/00; B01D37/02; B01D37/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
The process as set forth in claim 1 wherein the totalizing is brought about by synchronizing the flowmeter and density gauge.
Claim 2
Dependent Claim
24 words
The process as set forth in claim 1 together with the additional step of packing the flowmeter and density gauge with water after use.
References Cited (Backward Citations)
US3362533A
Cited
US3349913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |