US3554266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing viscous material
Assignee: Artisan Industries Inc
•
Filing: 1969-05-29
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Granted: 1971-01-12
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Expires: 1989-05-29
Abstract
Abstract A horizontally axised rotary wiped thin-film type evaporator for the processing of viscous material having within the product outlet of the evaporator an auger screw in combination with a screw pump. The auger screw removes viscous thixotropic material from the evaporator and transfers it to the screw pump which discharges the material.
Inventors
- 👤 James L Baird
- 👤 Leo J Monty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:24
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/22; B01D1/222; B01D1/223; B01D1/225; F; F04; F04C; F04C11/00; F04C11/005; F04C13/00; F04C13/001
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
displacing positively without back slippage the material through the terminal portion of the product outlet to discharge the material from the product outlet.
Claim 2
Dependent Claim
60 words
The method of claim 1 which includes cleaning a reaction vessel containing resinous material accumulated from prior processing operations by: introducing a solvent into the reaction vessel; contacting the resinous material with the solvent; removing the resinous material from the reaction vessel walls; and wiping the solvent containing the resinous material in thin film form on the surface of revolution.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the resinous material is a vinyl resin and the solvent is a cyclic hydrocarbon.
Claim 4
Dependent Claim
18 words
The method of claim 3 wherein the vinyl resin is polyvinyl chloride and the cyclic hydrocarbon is tetrahydrofuran.
Claim 5
Dependent Claim
28 words
The method of claim 4 which includes dissolving the polyvinyl chloride in the tetrahydrofuran prior to placing the solvent in thin film form on the surface of revolution.
Claim 6
Dependent Claim
66 words
The method of claim 1 wherein the resinous material is a vinyl chloride resin and the solvent is tetrahydrofuran and which includes dissolving the polyvinyl chloriDe in the tetrahydrofuran at a temperature of between 120 and 150* F. prior to placing the solvent in thin film form on the surface of revolution and further wherein 99 percent of the solvent is recovered as a vapor stream.
Claim 7
Dependent Claim
21 words
The method of claim 6 wherein the vinyl chloride resin is recovered at a viscosity between about 25,000 to 250,000 Hz.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |