Patent US3659983A successfully refreshed from Google Patents.
US3659983A
Expired / Lapsed
US
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Spinnerette for the production of hollow fibers
Assignee: Dow Chemical Co
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Filing: 1969-02-19
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Granted: 1972-05-02
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Expires: 1989-02-19
Abstract
Abstract A spinnerette for producing hollow fibers and particularly for producing fine bore, uniform permeable hollow fibers useful as the separation membrane in reverse osmosis, ultrafiltration, etc. is disclosed. The spinnerette combines a unique molten polymer passageway and gas passageway to supply an inert gas to the center of the hollow fiber as it is extruded from the orifice.
Inventors
- 👤 Earl A Mclain
- 👤 Henry I Mahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:54
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
In a spinnerette for making hollow fibers comprising a body member having an inlet side and an outlet side, said body member defining a feed chamber extending part way therein from the inlet side, said chamber having sidewalls, a bottom and a divider member extending inwardly at least part way across the chamber from a sidewall and integral with the bottom of said chamber and an orifice extending part way therein from the outlet side and generally disposed under the divider member, said orifice communicating with the feed chamber; the improvement which consists of a gas inlet passageway extending therein into said divider member, a gas outlet passageway one end of which communicates with said gas inlet passageway and the other end of which terminates at the outlet surface enclosed by said orifice, and said gas outlet passageway having a counterbore adjacent the outlet surface enclosed by said orifice; wherein said annular orifice has an outside diameter of about 0.024 to 0.100 inches, an inside diameter of about 0.021 to 0.08 inches, and wherein said counterbore has a diameter of about 0.018 to 0.056 inches.
Claim 2
Dependent Claim
185 words
In a spinnerette for making hollow fibers comprising a body member having an inlet side and an outlet side, said body member defining a feed chamber extending part way therein from the inlet side, said chamber having sidewalls, a bottom and a divider member extending inwardly at least part way across the chamber from a sidewall and integral with the bottom of said chamber and an orifice extending part way therein from the outlet side and generally disposed under the divider member, said orifice communicating with the feed chamber; the improvement which consists of a gas inlet passageway extending therein into said divider member, a gas outlet passageway one end of which communicates with said gas inlet passageway and the other end of which terminates at the outlet surface enclosed by said orifice, and said gas outlet passageway having a counterbore adjacent the outlet surface enclosed by said orifice; wherein said annular orifice has an outside diameter of about 0.024 to 0.100 inches, an inside diameter of about 0.021 to 0.08 inches, and wherein said counterbore has a diameter of about 0.018 to 0.056 inches.
Claim 3
Dependent Claim
12 words
The spinnerette of claim 1 wherein said orifice is an annular orifice.
Claim 4
Dependent Claim
40 words
The spinnerette of claim 1 wherein said body member further defines a conduit traversing the divider member wherein said conduit communicates with the portion of the endless passageway which is disposed under the divider member and with the feed chamber.
Claim 5
Dependent Claim
160 words
In a spinnerette for making hollow fibers comprising a body member having an inlet side and an outlet side, said body member defining a pair of coaxial bores in close spaced relationship extending part way therein from the inlet side and an annular orifice extending part way therein from the outlet side and generally disposed under said bores, said annular orifice communicating with both bores; the improvement which consists of a gas inlet extending therein into the body member portion between said bores, a gas outlet one end of which communicates with the gas inlet and the other end of which terminates at the outlet surface enclosed by said orifice, and said gas outlet having a counterbore adjacent the outlet surface enclosed by said orifice; wherein said orifice has an outside diameter of about 0.024 to 0.100 inches, an inside diameter of about 0.021 to 0.08 inches, and wherein said counterbore has a diameter of about 0.018 to 0.056 inches.
Claim 6
Dependent Claim
160 words
In a spinnerette for making hollow fibers comprising a body member having an inlet side and an outlet side, said body member defining a pair of coaxial bores in close spaced relationship extending part way therein from the inlet side and an annular orifice extending part way therein from the outlet side and generally disposed under said bores, said annular orifice communicating with both bores; the improvement which consists of a gas inlet extending therein into the body member portion between said bores, a gas outlet one end of which communicates with the gas inlet and the other end of which terminates at the outlet surface enclosed by said orifice, and said gas outlet having a counterbore adjacent the outlet surface enclosed by said orifice; wherein said orifice has an outside diameter of about 0.024 to 0.100 inches, an inside diameter of about 0.021 to 0.08 inches, and wherein said counterbore has a diameter of about 0.018 to 0.056 inches.
Claim 7
Dependent Claim
40 words
The spinnerette of claim 4 wherein said body member further defines a conduit traversing the divider member wherein said conduit communicates with the portion of the endless passageway which is disposed under the divider member and with the feed chamber.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |