Patent US3732985A successfully refreshed from Google Patents.
US3732985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen retainer assembly
Assignee: Robertshaw Controls Co
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Filing: 1971-05-24
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Granted: 1973-05-15
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Expires: 1991-05-24
Abstract
Abstract A method for installing a screen in a conduit includes the steps of draping the screen across a convoluted band of ductile material, positioning the screen-draped band within the conduit in general alignment with a continuous groove provided in the interior surface of the conduit, and expanding the convoluted band so that the band fits snugly in the groove to thereby hold the screen firmly in place with its periphery pinched between the band and the groove. The resultant screen retainer assembly has the advantages that the screen retaining means does not impede the flow of fluid through the conduit and that the expanded band cannot become displaced or accidentally removed.
Inventors
- 👤 D Murrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:02
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/01; B01D29/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
205 words
In a flow control valve, the combination comprising a casing having an inlet and an outlet, a flow conduit in said casing between said inlet and outlet, said flow conduit having an annular configuration in crosssection, an annular groove in said flow conduit having a diameter larger than that of said flow conduit, a circular screen in said flow conduit having a cross-sectional dimension larger than the diameter of said annular groove, said screen having its peripheral portion disposed in said annular groove, a generally annular band of ductile material movable from an unexpanded configuration to an expanded configuration, said band in its unexpanded configuration having a maximum diameter lesser than that of said flow conduit, said band in its expanded configuration having a minimum diameter larger than that of said flow conduit, a plurality of convolutions on said band facilitating movement of said band from its unexpanded configuration to its expaNded configuration, said band in its expanded configuration pinching the periphery of said screen in said annular groove for fixedly mounting said screen relative to said flow conduit, and said band in its expanded configuration being completely disposed in said annular groove so as not to impede a fluid flow through said flow conduit.
Claim 2
Dependent Claim
205 words
In a flow control valve, the combination comprising a casing having an inlet and an outlet, a flow conduit in said casing between said inlet and outlet, said flow conduit having an annular configuration in crosssection, an annular groove in said flow conduit having a diameter larger than that of said flow conduit, a circular screen in said flow conduit having a cross-sectional dimension larger than the diameter of said annular groove, said screen having its peripheral portion disposed in said annular groove, a generally annular band of ductile material movable from an unexpanded configuration to an expanded configuration, said band in its unexpanded configuration having a maximum diameter lesser than that of said flow conduit, said band in its expanded configuration having a minimum diameter larger than that of said flow conduit, a plurality of convolutions on said band facilitating movement of said band from its unexpanded configuration to its expaNded configuration, said band in its expanded configuration pinching the periphery of said screen in said annular groove for fixedly mounting said screen relative to said flow conduit, and said band in its expanded configuration being completely disposed in said annular groove so as not to impede a fluid flow through said flow conduit.
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |