Patent US2621156A successfully refreshed from Google Patents.
US2621156A
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Method for feeding filter aid
Assignee: Bowser Inc
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Filing: 1947-04-10
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Granted: 1952-12-09
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Expires: 1967-04-10
Abstract
No abstract record available.
Inventors
- 👤 Lawrence S Farrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:29
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/687
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE METHOD OF FEEDING FILTER AID INTO A FLOW LINE WHICH COMPRISES SEGREGATING A MASS OF FILTER AID MATERIAL ON A THIN, PERFORATE SUPPORTING MEMBER IN A TANK, WETTING SAID MATERIAL, ADMITTING A FLOW OF LIQUID TO SAID TANK AND DIRECTING IT ALONG THE UNDERNEATH SIDE OF SAID MEMBER SO AS TO TAKE FILTER AID INTO SUSPENSION IN THE LIQUID THROUGH SAID MEMBER, AND THEREAFTER PASSING THE FILTER AID BEARING LIQUID TO A FILTER.
Claim 2
Independent Claim
74 words
THE METHOD OF FEEDING FILTER AID INTO A FLOW LINE WHICH COMPRISES SEGREGATING A MASS OF FILTER AID MATERIAL ON A THIN, PERFORATE SUPPORTING MEMBER IN A TANK, WETTING SAID MATERIAL, ADMITTING A FLOW OF LIQUID TO SAID TANK AND DIRECTING IT ALONG THE UNDERNEATH SIDE OF SAID MEMBER SO AS TO TAKE FILTER AID INTO SUSPENSION IN THE LIQUID THROUGH SAID MEMBER, AND THEREAFTER PASSING THE FILTER AID BEARING LIQUID TO A FILTER.
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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) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |