US3721634A
Expired / Lapsed
US
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Polymerization process
Assignee: Cities Service Co
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Filing: 1971-07-30
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Granted: 1973-03-20
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Expires: 1991-07-30
Abstract
Abstract METALLIC IRON IS USED AS AN INGREDIENT OF THE POLYMERIZATION RECIPE TO IMPROVE THE MELT FLOW OF A POLYMER, PREPARED BY POLYMERIZING AT LEAST ONE VINYLIDENE MONOMER, E.G., STYRENE, IN THE PRESENCE OF A HALOGENATED FLAME RETARDANT. A PREFERRED EMBODIMENT OF THE INVENTION IS THE IMPROVEMENT OF THE MELT FLOW OF A FOAMABLE POLYMER PREPARED BY SUSPENSION POLYMERIZATION, WITH THE CONSEQUENT IMPROVEMENT OF THE DIMENSIONAL STABILITY OF A SELF-EXTINGUISHING FOAM PREPARED THEREFROM.
Inventors
- 👤 J Versnel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:30
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0095; C08F; C08F2/00; C08F2/44; C08K; C08K3/00; C08K3/02; C08K3/08; C08L; C08L15/00; C08L15/02; C08L57/00; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/907
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |