US3265643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellular polystypene and method of manufacturing the same
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1963-09-09
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Granted: 1966-08-09
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Expires: 1983-09-09
Abstract
No abstract record available.
Inventors
- 👤 Hatano Itaru
- 👤 Senuma Kazuya
- 👤 Kasamatsu Tadashi
- 👤 Nishino Minoru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:31
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/20; Y; Y10; Y10S; Y10S521/00; Y10S521/908
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
THE METHOD OF MANUFACTURING EXPANDABLE POLYMERIZED POLYSTYRENE PARTICLES WHICH INCLUDES THE POLYMERIZAMER, ADDING A FOAMING AGENT TO THE POLYMERIZATION SYSTEM WHEN THE RATE OF CONVERSION OF THE STYRENE MONOMER IS ABOUT 80 TO 98% OF COMPLETION, THE FOAMING AGENT TION AN AQUEOUS SUSPENSION MEDIUM OF A STYRENE MONOBEING OF THE TYPE HAVING CHARACTERISTICS FOR EXPANSION OF POLYMERIZED POLYSTYRENE PARICLES TO FROM 60 TO 400 CC./ 10G, THE FOAMING AGENT FURTHER COMPRISING AN ALIPHATIC HYDROCARBON HAVING FROM 3 TO 4 CARBONS, SUFFIICIENT STYRENE BEING INITIALLY SUPPLIED TO THE SYSTEM TO PROVIDE THE MONOMER FOR FORMATION OF EXPANDABLE POLYMERIZED POLYSTYRENE PARTICLES AND A RESIDUAL QUANTITY THEREOF EQUIVALENT TO THE QUANTITY OF SOLVENT REQUIRED FOR PARTICLE ABSORPTION AND HOLDING OF THE FOAMING AGENT, ADDING A NITRITE CARRIER TO THE SYSTEM WHEN THE RATE OF CONVERSION OF THE STYRENE MONOMER IS LESS THAN 98% COMPLETE, THE QUANTITY OF NITRITE CARRIER ADDED BEING FROM 0.0003 TO 0.0500% BY WEIGHT OF THE TOTAL STYRENE IN THE SYSTEM, AND SELECTIVELY INTRODUCING CALCINED PERLITE INTO THE AQUEOUS MEDIUM EITHER DURING POLYMERIZATION OR AFTER COMPLETION OF POLYMERIZATION.
Claim 2
Independent Claim
178 words
THE METHOD OF MANUFACTURING EXPANDABLE POLYMERIZED POLYSTYRENE PARTICLES WHICH INCLUDES THE POLYMERIZAMER, ADDING A FOAMING AGENT TO THE POLYMERIZATION SYSTEM WHEN THE RATE OF CONVERSION OF THE STYRENE MONOMER IS ABOUT 80 TO 98% OF COMPLETION, THE FOAMING AGENT TION AN AQUEOUS SUSPENSION MEDIUM OF A STYRENE MONOBEING OF THE TYPE HAVING CHARACTERISTICS FOR EXPANSION OF POLYMERIZED POLYSTYRENE PARICLES TO FROM 60 TO 400 CC./ 10G, THE FOAMING AGENT FURTHER COMPRISING AN ALIPHATIC HYDROCARBON HAVING FROM 3 TO 4 CARBONS, SUFFIICIENT STYRENE BEING INITIALLY SUPPLIED TO THE SYSTEM TO PROVIDE THE MONOMER FOR FORMATION OF EXPANDABLE POLYMERIZED POLYSTYRENE PARTICLES AND A RESIDUAL QUANTITY THEREOF EQUIVALENT TO THE QUANTITY OF SOLVENT REQUIRED FOR PARTICLE ABSORPTION AND HOLDING OF THE FOAMING AGENT, ADDING A NITRITE CARRIER TO THE SYSTEM WHEN THE RATE OF CONVERSION OF THE STYRENE MONOMER IS LESS THAN 98% COMPLETE, THE QUANTITY OF NITRITE CARRIER ADDED BEING FROM 0.0003 TO 0.0500% BY WEIGHT OF THE TOTAL STYRENE IN THE SYSTEM, AND SELECTIVELY INTRODUCING CALCINED PERLITE INTO THE AQUEOUS MEDIUM EITHER DURING POLYMERIZATION OR AFTER COMPLETION OF POLYMERIZATION.
References Cited (Backward Citations)
US3192169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |