US3087620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter apparatus
Assignee: Individual
•
Filing: 1961-03-27
•
Granted: 1963-04-30
•
Expires: 1981-03-27
Abstract
No abstract record available.
Inventors
- 👤 Hirs Gene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:46
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/09; B01D35/00; B01D35/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
149 words
IN A FILTER, AN OPEN-TOPPED TANK ADAPTED TO MAINTAIN A BODY OF CONTAMINATED LIQUID AT ATMOSPHERIC PRESSURES AND HAVING WALL MEANS BENEATH THE LEVEL OF SAID BODY OF LIQUID PROVIDED WITH AN OUTLET OPENING, MEANS DEFINING A VACUUM CHAMBER UNDERLYING SAID WALL MEANS AND HAVING AN UPPER OPENING REGISTERING WITH SAID OUTLET OPENING, SAID VACUUM CHAMBER BEING SEALED CONTINUOUSLY FROM THE ATMOSPHERE BY LIQUID IN THE TANK, A PERFORATE FILTER MEDIUM OF A SIZE AND EXTENT TO AT LEAST COVER SAID OPENINGS AND EFFECTIVE TO REMOVE CONTAMINANT FROM LIQUID FLOWING FROM SAID TANK INTO SAID CHAMBER, MEANS FOR WITHDRAWING FILTRATE LIQUID FROM SAID CHAMBER TO CREATE A SUB-ATMOSPHERIC PRESSURE IN SAID CHAMBER, THEREBY INDUCING LIQUID FLOW THROUGH THE MEDIUM AT AN EFFECTIVE PRESSURE DIFFERENTIAL GREATER THAN THAT RESULTING FROM THE DEPTH OF LIQUID OVERLYING THE MEDIUM, AN ENDLESS CONVEYOR IN THE FORM OF A LOOP HAVING A LOWER REACH
References Cited (Backward Citations)
US392606A
Cited
US1403369A
Cited
US2665812A
Cited
US2675129A
Cited
US2861688A
Cited
US2867324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |