US3061570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of crystalline polystyrene solutions
Assignee: Monsanto Chemicals Ltd
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Filing: 1957-01-15
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Granted: 1962-10-30
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Expires: 1977-01-15
Abstract
No abstract record available.
Inventors
- 👤 Roland J Kern
- 👤 Allen S Kenyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:40
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/11; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
THE METHOD OF PREPARING A ROOM-TEMPERATURE STABLE SOLUTION FROM CRYSTALLINE POLYSTYRENE CONTAINING AT LEAST 2 WEIGHT PERCENT AND UP TO 33 WEIGHT PERCENT OF POLYSTYRENE COMPRISING HEATING CRYSTALLINE POLYSTYRENE IN A PRESSURE VESSEL TO A TEMPERATURE OF FROM ABOUT 160*C. TO ABOUT 195*C. WITH BETWEEN ABOUT 2 AND ABOUT 49 TIMES BY WEIGHT OF DIOXANE AND THE DIOXANE IS MAINTAINED IN THE LIQUID PHASE THROUGHOUT THE HEATING OPERATION, AND THEREAFTER COOLING THE SOLUTION OF POLYSTYRENE TO ROOM TEMPERATURE.
Claim 2
Independent Claim
78 words
THE METHOD OF PREPARING A ROOM-TEMPERATURE STABLE SOLUTION FROM CRYSTALLINE POLYSTYRENE CONTAINING AT LEAST 2 WEIGHT PERCENT AND UP TO 33 WEIGHT PERCENT OF POLYSTYRENE COMPRISING HEATING CRYSTALLINE POLYSTYRENE IN A PRESSURE VESSEL TO A TEMPERATURE OF FROM ABOUT 160*C. TO ABOUT 195*C. WITH BETWEEN ABOUT 2 AND ABOUT 49 TIMES BY WEIGHT OF DIOXANE AND THE DIOXANE IS MAINTAINED IN THE LIQUID PHASE THROUGHOUT THE HEATING OPERATION, AND THEREAFTER COOLING THE SOLUTION OF POLYSTYRENE TO ROOM TEMPERATURE.
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) | 1965-10-29 | 1966-04-30 | 1966-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-29 | 1970-04-30 | 1970-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-29 | 1974-04-30 | 1974-10-30 | $7700.00 | Window Closed / Lapsed |