Patent US2540146A successfully refreshed from Google Patents.
US2540146A
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Method for controlled blending of polystyrene with modifiers
Assignee: Dow Chemical Co
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Filing: 1948-05-27
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Granted: 1951-02-06
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Expires: 1968-05-27
Abstract
No abstract record available.
Inventors
- 👤 Kenneth E Stober
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:25
CPC Classifications
B; B01; B01F; B01F35/00; B01F35/80; B01F35/82; B01F35/71; B01F35/717; B01F35/7173; B01F35/71731; B01F35/71775; B29; B29B; B29B7/00; B29B7/30; B29B7/58; B29B7/60; B29B7/72; B29B7/726; B29B7/728; B29B7/74; B29B7/7476; B29B7/748; B29B7/80; B29B7/82; B29B7/826; B29B7/88; B29B9/00; B29B9/02; B29B9/06; B29B9/12; B29C; B29C48/00; B29C48/25; B29C48/285; B29C48/29; B29C48/36; B29C48/375; B29C48/38; B29C48/395; B29C48/92; C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; B01F23/00; B01F23/50; B01F23/56; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92238; B29C2948/92323; B29C2948/92438; B29C2948/92504; B29C2948/9258; B29C2948/9259; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92885; B29C2948/92952; B29C48/03; B29C48/04; B29C48/288; B29C48/2886; B29K; B29K2105/00; B29K2105/0005; B29K2105/06; B29K2105/16; C08J2425/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
THE METHOD WHICH COMPRISES PROVIDING AT LEAST ONE PRE-MIXED CONCENTRATE OF POLYSTYRENE CONTAINING A CONSTANT AMOUNT OF AT LEAST ONE MODIFYING AGENT THEREFOR, SUPPLYING EACH SUCH CONCENTRATE AT A CONSTANT RATE TO AN EXTRUSION ZONE, CONTINUOUSLY EXTRUDING EACH SUCH CONCENTRATE AT THE SAME CONSTANT RATE AT WHICH IT IS SUPPLIED, TO PROVIDE THE DESIRED FINAL RATIO OF MODIFIERS TO ONE ANOTHER, INTO A MUCH LARGER MIXING AND EXTRUSION ZONE, BLENDING EACH CONCENTRATE THEREIN WITH AN AMOUNT OF POLYSTYRENE TO GIVE THE DESIRED FINAL RATIO OF EACH MODIFIER TO THE POLYSTRYENE, EXTRUDING THE SO-FORMED BLEND AS A THIN STRIP FROM THE LAST SAID ZONE, CONTINUOUSLY APPLYING A RADIO FREQUENCY POTENTIAL ACROSS THE MOVING DIELECTRIC STRIP ISSUING FROM SAID ZONE AND MEASURING ITS ELECTRICAL CAPACITY, AND INSTANTANEOUSLY VARYING THE RATE OF EXTRUSION RESPONSIVE TO AND IN AN AMOUNT PROPORTIONAL TO AND OPPOSING ANY VARIATIONS IN SAID CAPACITY THEREBY COMPENSATING FOR ANY CHANGES IN THE MASS OF DIELECTRIC AND PRODUCING A CONTINUOUS STRIP OF UNIFORMLY MODIFIED POLYSTYRENE AT ESSENTIALLY A CONSTANT RATE.
Claim 2
Independent Claim
169 words
THE METHOD WHICH COMPRISES PROVIDING AT LEAST ONE PRE-MIXED CONCENTRATE OF POLYSTYRENE CONTAINING A CONSTANT AMOUNT OF AT LEAST ONE MODIFYING AGENT THEREFOR, SUPPLYING EACH SUCH CONCENTRATE AT A CONSTANT RATE TO AN EXTRUSION ZONE, CONTINUOUSLY EXTRUDING EACH SUCH CONCENTRATE AT THE SAME CONSTANT RATE AT WHICH IT IS SUPPLIED, TO PROVIDE THE DESIRED FINAL RATIO OF MODIFIERS TO ONE ANOTHER, INTO A MUCH LARGER MIXING AND EXTRUSION ZONE, BLENDING EACH CONCENTRATE THEREIN WITH AN AMOUNT OF POLYSTYRENE TO GIVE THE DESIRED FINAL RATIO OF EACH MODIFIER TO THE POLYSTRYENE, EXTRUDING THE SO-FORMED BLEND AS A THIN STRIP FROM THE LAST SAID ZONE, CONTINUOUSLY APPLYING A RADIO FREQUENCY POTENTIAL ACROSS THE MOVING DIELECTRIC STRIP ISSUING FROM SAID ZONE AND MEASURING ITS ELECTRICAL CAPACITY, AND INSTANTANEOUSLY VARYING THE RATE OF EXTRUSION RESPONSIVE TO AND IN AN AMOUNT PROPORTIONAL TO AND OPPOSING ANY VARIATIONS IN SAID CAPACITY THEREBY COMPENSATING FOR ANY CHANGES IN THE MASS OF DIELECTRIC AND PRODUCING A CONTINUOUS STRIP OF UNIFORMLY MODIFIED POLYSTYRENE AT ESSENTIALLY A CONSTANT RATE.
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) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |