Patent US2566567A successfully refreshed from Google Patents.
US2566567A
Expired / Lapsed
US
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Production of polystyrene beads
Assignee: Distillers Co Yeast Ltd
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Filing: 1946-05-14
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Granted: 1951-09-04
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Expires: 1966-05-14
Abstract
No abstract record available.
Inventors
- 👤 Hutchinson Henry Malcolm
- 👤 Staudinger Johann Josef Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:51
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/14; B29B; B29B9/00; B29B9/02; B29B9/06; B29B9/065; C; C08; C08F; C08F2/00; Y; Y10; Y10S; Y10S264/00; Y10S264/37; Y10S526/00; Y10S526/909; Y10S526/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS FOR THE PRODUCTION OF POLYMER IN BEAD FORM WHICH COMPRISES FORMING AND SEPARATING INDIVIDUAL DISCRETE SUBSTNAITLLY UNIFORMLY SIZED BEADS FROM A PARTIALLY POLYMERISED VISCOUS LIQUID MIXTURE SELECTED FROM THE GROUP CONSISTING OF STYRENE AND NUCLEAR-ALKYL- AND NUCLEARHALOGEN-SUBSTITUTED STYRENES CONTAINING AT LEAST 40% BY WEIGHT OF THE POLYMER, INTRODUCING SUCH BEADS INTO A HEATED INERT LIQUID MEDIUM, HAVING A VISCOSITY OF NOT LESS THAN 10 CENTIPOISES AT THE POLYMERISATION TEMPERATURE, AND WITH WICH INERT LIQUID MEDIUM THE BEADS ARE SUBSTANTIALLY IMMISCIBLE, SUBSTANTIALLY COMPLETELY POLYMERISING THE MIXTURE IN THE FORM OF SUCH UNIFORMLY SIZED THE MIXTURE IN THE BEADS ARE SUSPENDED IN THE LIQUID, THE RATE OF POLYMERISATION BEING IN THE RANGE 2.5% TO 60% PER HOUR, AND RECOVERING SUCH POLYMERISED BEADS.
Claim 2
Dependent Claim
122 words
A PROCESS FOR THE PRODUCTION OF POLYMER IN BEAD FORM WHICH COMPRISES FORMING AND SEPARATING INDIVIDUAL DISCRETE SUBSTNAITLLY UNIFORMLY SIZED BEADS FROM A PARTIALLY POLYMERISED VISCOUS LIQUID MIXTURE SELECTED FROM THE GROUP CONSISTING OF STYRENE AND NUCLEAR-ALKYL- AND NUCLEARHALOGEN-SUBSTITUTED STYRENES CONTAINING AT LEAST 40% BY WEIGHT OF THE POLYMER, INTRODUCING SUCH BEADS INTO A HEATED INERT LIQUID MEDIUM, HAVING A VISCOSITY OF NOT LESS THAN 10 CENTIPOISES AT THE POLYMERISATION TEMPERATURE, AND WITH WICH INERT LIQUID MEDIUM THE BEADS ARE SUBSTANTIALLY IMMISCIBLE, SUBSTANTIALLY COMPLETELY POLYMERISING THE MIXTURE IN THE FORM OF SUCH UNIFORMLY SIZED THE MIXTURE IN THE BEADS ARE SUSPENDED IN THE LIQUID, THE RATE OF POLYMERISATION BEING IN THE RANGE 2.5% TO 60% PER HOUR, AND RECOVERING SUCH POLYMERISED BEADS.
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) | 1954-09-03 | 1955-03-05 | 1955-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-03 | 1959-03-05 | 1959-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-03 | 1963-03-05 | 1963-09-04 | $7700.00 | Window Closed / Lapsed |