Patent US3357566A successfully refreshed from Google Patents.
US3357566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual element filter assembly with backwash arms
Assignee: Zurn Industries LLC
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Filing: 1964-06-22
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Granted: 1967-12-12
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Expires: 1984-06-22
Abstract
No abstract record available.
Inventors
- 👤 John H Schmid
- 👤 Ramon J Zentis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:29
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/117; B01D29/118; B01D29/50; B01D29/52; B01D29/54; B01D29/62; B01D29/66; B01D29/68; B01D29/682; B01D35/00; B01D35/02; B01D2201/00; B01D2201/08; B01D2201/081; B01D2201/082; B01D2201/28; B01D2201/287
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
A STRAINER COMPRISING A BODY HAVING AN INLET AND AN OUTLET, TWO AXIALLY SPACED, GENERALLY CYLINDRICAL STRAINER ELEMENTS IN SAID BODY, ONE DISPOSED ON THE OPPOSITE SIDE OF SAID INLET FROM THE OTHER, MEANS TO ADMIT FLUID FROM SAID INLET TO THE INSIDE OF SAID ELEMENTS, A HOLLOW SHAFT IN SAID BODY GENERALLY COAXIAL WITH THE CENTRAL AXES OF SAID ELEMENTS, TWO BACKWASH ARMS, ONE IN EACH OF SAID STRAINER ELEMENT, SLIDINGLY ENGAGING THE INSIDE SURFACE THEREOF, AND MEANS ON SAID BACKWASH ARMS CONNECTING THE INSIDE OF SAID HOLLOW SHAFT IN FLUID FLOW RELATION WITH THE SURFACE OF SAID STRAINER ELEMENTS ENGAGED BY SAID BACKWASH ARMS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |