US3694535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for removing volatile substances from viscous compositions
Assignee: Toyo Koatsu Industries Inc
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Filing: 1970-10-15
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Granted: 1972-09-26
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Expires: 1990-10-15
Abstract
Abstract A process for removing volatile substances from viscous compositions, for example, removing volatile solvent and unreacted monomer from polystyrene. The composition is heated to a temperature above the boiling points of the volatile substances at the pressure employed in the operation. The composition is then formed into strands and the strands are impacted against a solid surface. The composition is then caused to flow as a film over a heated surface while the strands and film are exposed to sub-atmospheric pressure.
Inventors
- 👤 Koji Kimoto Kamakura
- 👤 Yoshinari Yamagisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:26
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/0021; C; C08; C08F; C08F6/00; C08F6/06; C08F6/12; Y; Y10; Y10S; Y10S159/00; Y10S159/06; Y10S264/00; Y10S264/13
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
Process as claimed in claim 1 wherein said polymer is polystyrene and said monomer is styrene.
Claim 2
Dependent Claim
28 words
Process as claimed in claim 2 wherein the temperature of said mixture in steps (A), (B), (C), and (D) is the range of about 150*C. to about 300*C.
Claim 3
Dependent Claim
25 words
Process as claimed in claim 3 wherein the subatmospheric pressure in said steps is in the range of about 50 to about 100 mm./Hg, absolute.
Claim 4
Dependent Claim
24 words
Process as claimed in claim 1 wherein said strand in foaming condition is formed by discharging said mixture under said pressure through an orifice.
Claim 5
Dependent Claim
19 words
Process as claimed in claim 5 wherein said orifice is circular having a diameter of 1 to 4 mm.
Claim 6
Dependent Claim
13 words
Process as claimed in claim 6 wherein a plurality of orifices is provided.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |