USRE27681E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry chemical feeder method and apparatus
Assignee: —
•
Filing: 1970-09-24
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Granted: 1973-06-19
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Expires: 1990-09-24
Abstract
Abstract A METHODAND MEANS FOR FEEDING AND MIXING A DRY CHEMICAL OF THE FREE FLOWING TYPE, SUCH AS AGGLOMERATIVE POLYMERS WITH A LIQUID, TO PROVIDE A SMOOTH, CLEAR SOLUTION WHICH CAN BE PROPORTIONED AND ADDED DIRECTLY INTO A PRIMARY OR SECONDARY SYSTEM WITH ACCURACY. THE CHEMICAL IS SEPARATED INTO SMALL INDIVIDUAL PARTICLES WHICH ARE DROPPED INTO A GENTLE WETTING PLANE WHEREBY EACH PARTICLE IS COMPLETELY WETTED. THE WETTED PARTICLE ENTERS THE MIXING SOLUTION AND IS QUICKLY DISSOLVED INTO A SMOOTH, CLEAR MIXTURE.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:58
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/0015; B01J8/003; B01F; B01F25/00; B01F25/70; B01F25/72; B01F25/721
Claims Analysis
Total Claims: 0
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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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |