Patent US4083711A successfully refreshed from Google Patents.
US4083711A
Expired / Lapsed
US
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Glass forehearth having a viscosity pump
Assignee: PPG Industries Inc
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Filing: 1977-03-28
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Granted: 1978-04-11
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Expires: 1997-03-28
Abstract
Abstract A delivery system is disclosed for pumping and pressurizing viscous fluid materials, such as molten glass. The pump comprises a rotating rotor which is located in a channel of the viscous fluid, such as in the forehearth of a glass melting furnace. In a glassmaking operation, the rotor uses the viscous drag of the molten glass against it to pump the molten glass from an open channel into a closed and pressurized channel where the pressurized molten glass may be, for example, extruded into glass filaments. The pumping system described also finds utility in pumping other viscous materials such as resins in fluid form.
Inventors
- 👤 Thomas H. Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:31
CPC Classifications
F; F04; F04D; F04D5/00; F04D5/001; C; C03; C03B; C03B5/00; C03B5/16; C03B5/18; C03B5/187; C03B7/00; C03B7/02; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
A delivery system for molten glass comprising a forehearth having an open section and a closed section, said open section containing unpressurized molten glass therein and said closed section containing pressurized molten glass, means for sealing said closed section to pressurize it and pump means including a rotor having a substantially uniform surface, said rotor being mounted within but adjacent to a wall portion of the forehearth at a position between said open and closed sections, said wall portion being shaped to a curve correspondent to but spaced from the outer surface of the rotor such that said portion of said forehearth acts as a stator with said rotor to transport molten glass from the open section to the closed section using the viscous drag of the molten glass against the forehearth and the rotor as the rotor is rotated within the molten glass in the forehearth.
Claim 2
Dependent Claim
147 words
A delivery system for molten glass comprising a forehearth having an open section and a closed section, said open section containing unpressurized molten glass therein and said closed section containing pressurized molten glass, means for sealing said closed section to pressurize it and pump means including a rotor having a substantially uniform surface, said rotor being mounted within but adjacent to a wall portion of the forehearth at a position between said open and closed sections, said wall portion being shaped to a curve correspondent to but spaced from the outer surface of the rotor such that said portion of said forehearth acts as a stator with said rotor to transport molten glass from the open section to the closed section using the viscous drag of the molten glass against the forehearth and the rotor as the rotor is rotated within the molten glass in the forehearth.
Claim 3
Dependent Claim
15 words
The system of claim 1 including heating elements embedded within the bottom of the forehearth.
Claim 4
Dependent Claim
52 words
The system of claim 1 wherein the rotor comprises a shaft, a plurality of wings surrounding the shaft, a plurality of tension members connected to the shaft and the wings and a plurality of torque members connected to the shaft and embedded in castable ceramic surrounding the shaft to drive the wings.
Claim 5
Dependent Claim
14 words
The system of claim 3 wherein the wings are formed of low conductivity ceramic.
Claim 6
Dependent Claim
16 words
The system of claim 4 wherein the wings are clad with a platinum or platinum-rhodium alloy.
Claim 7
Dependent Claim
16 words
The system of claim 3 wherein the tension members are connected to the shaft by springs.
Claim 8
Dependent Claim
23 words
The system of claim 3 including means for introducing a cooling fluid through a central shaft of the rotor to cool the rotor.
Claim 9
Dependent Claim
23 words
The system of claim 1 wherein the forehearth and rotor are sized to accommodate complete output of a glass melting furnace connected thereto.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |