US3276590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter
Assignee: Zurn Industries LLC
•
Filing: 1964-03-16
•
Granted: 1966-10-04
•
Expires: 1984-03-16
Abstract
No abstract record available.
Inventors
- 👤 John H Schmid
- 👤 Robert H Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:18
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/10; B01D24/14; B01D24/46; B01D24/4605; B01D24/461; B01D24/4631; B01D24/4668; B01D24/4673; B01D2201/00; B01D2201/08; B01D2201/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
A FILTER COMPRISING A TANK, SAID TANK HAVING GRANULAR FILTER MATERIAL THEREIN AND FILLING SAID TANK TO A SUBSTANTIAL DEPTH ABOVE THE BOTTOM THEREOF, AN EXIT OPENING FROM SAID TANK AND AN INLET OPENING TO SAID TANK FOR CONNECTING LIQUID TO BE FILTERED, SAID INLET OPENING BEING DISPOSED ADJACENT THE TOP OF SAID TANK, A VERTICAL PIPE OPEN AT ITS UPPER END SUPPORTED IN SAID TANK AT THE CENTER THEREOF AND GENERALLY CONCENTRIC THERETO, AND BRANCH PIPES ATTACHED TO SAID VERTICAL PIPE AND COMMUNICATING WITH THE INSIDE THEREOF AND EXTENDIN OUTWARDLY GENERALLY PERPENDICULAR THERETO, SAID BRANCH PIPES BEING OPEN AT THEIR OUTER ENDS AND THE OUTER ENDS THEREOF TERMINATING A SUBSTANTIAL DISTANCE FROM THE INSIDE PERIPHERY OF SAID TANK, SAID TANK BEING ADAPTED TO HAVE LIQUID FLOW FROM SAID INLET OPENING TO THE TOP SURFACE OF SAID FILTER MATERIAL AND THENCE THROUGH SAID FILTER MATERIAL TO SAID EXIT OPENING, SAID FILTER FURTHER BEING ADAPTED TO HAVE WATER FLOW FROM SAID INLET OPENING INTO SAID OPEN UPPER END OF SAID VERTICAL PIPE AND THROUGH SAID BRANCH PIPES AND THROUGH SAID FILTER MATERIAL TO SAID EXIT OPENING.
Claim 2
Dependent Claim
185 words
A FILTER COMPRISING A TANK, SAID TANK HAVING GRANULAR FILTER MATERIAL THEREIN AND FILLING SAID TANK TO A SUBSTANTIAL DEPTH ABOVE THE BOTTOM THEREOF, AN EXIT OPENING FROM SAID TANK AND AN INLET OPENING TO SAID TANK FOR CONNECTING LIQUID TO BE FILTERED, SAID INLET OPENING BEING DISPOSED ADJACENT THE TOP OF SAID TANK, A VERTICAL PIPE OPEN AT ITS UPPER END SUPPORTED IN SAID TANK AT THE CENTER THEREOF AND GENERALLY CONCENTRIC THERETO, AND BRANCH PIPES ATTACHED TO SAID VERTICAL PIPE AND COMMUNICATING WITH THE INSIDE THEREOF AND EXTENDIN OUTWARDLY GENERALLY PERPENDICULAR THERETO, SAID BRANCH PIPES BEING OPEN AT THEIR OUTER ENDS AND THE OUTER ENDS THEREOF TERMINATING A SUBSTANTIAL DISTANCE FROM THE INSIDE PERIPHERY OF SAID TANK, SAID TANK BEING ADAPTED TO HAVE LIQUID FLOW FROM SAID INLET OPENING TO THE TOP SURFACE OF SAID FILTER MATERIAL AND THENCE THROUGH SAID FILTER MATERIAL TO SAID EXIT OPENING, SAID FILTER FURTHER BEING ADAPTED TO HAVE WATER FLOW FROM SAID INLET OPENING INTO SAID OPEN UPPER END OF SAID VERTICAL PIPE AND THROUGH SAID BRANCH PIPES AND THROUGH SAID FILTER MATERIAL TO SAID EXIT OPENING.
References Cited (Backward Citations)
US402658A
Cited
US446153A
Cited
GB189811786A
Cited
US903385A
Cited
GB191123906A
Cited
US2069621A
Cited
US2948400A
Cited
US3171801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |