US3475398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous polymerization in mass
Assignee: Compagnie de Saint Gobain SA
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Filing: 1961-04-11
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Granted: 1969-10-28
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Expires: 1981-04-11
Abstract
No abstract record available.
Inventors
- 👤 Michel Jobard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:44
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06; B; B01; B01J; B01J3/00; B01J3/002; C08F2/00; C08F2/02; Y; Y10; Y10S; Y10S526/00; Y10S526/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
THE METHOD OF POLYMERIZING VINYL CHLORIDE IN MASS WHICH COMPRISES ESTABLISHING WITHIN A PRESSURE VESSEL CONDITIONS OF TEMPERATURE, PRESSURE, AND AGITATION FAVORABLE TO POLYMERIZATION, CONTINUOUSLY INTRODUCING VINYL CHLORIDE MONOMER AND A CATALYST THEREFOR INTO THE PRESSURE VESSEL, ESTABLISHING A DEGREE OF POLYMERIZATION IN THE POLYMERIZATION MASS, AT LEAST ABOUT 15%, AT WHICH THE LIQUID MONOMER PHASE SUBSTANTIALLY DISAPPEARS BY ABSORPTION IN THE GRAINS OF THE POLYMER AND THE POLYMERIZATION MASS IS SUBSTANTIALLY COMPOSED OF SOLID POLYMER SWOLLEN BY LIQUID MONOMER AND MONOMER VAPOR, AND INTERMITTENTLY DISCHARGING FROM THE VESSEL GRANULAR POLYMER IMPREGNATED WITH MONOMER AND HAVING A DEGREE OF POLYMERIZATION BELOW THAT AT WHICH THE GASEOUS MONOMER LOSES THE CHARACTERISTIC OF A SATURATED VAPOR, NOT SUBSTANTIALLY OVER 85%, BY INTERMITTENTLY AND BRIEFLY RELEASING QUANTITIES OF POLYMER FROM A POSITION BENEATH THE LEVEL OF THE POLYMERIZATION MASS AT WHICH LIQUID MONOMER IS NOT DISCHARGED WITH THE IMPREGNATED POLYMER, UTILIZING THE EXPANSION OF THE MONOMER ABSORBED BY THE GRAINS OF POLYMER TO EFFECT THE DISCHARGE.
Claim 2
Independent Claim
163 words
THE METHOD OF POLYMERIZING VINYL CHLORIDE IN MASS WHICH COMPRISES ESTABLISHING WITHIN A PRESSURE VESSEL CONDITIONS OF TEMPERATURE, PRESSURE, AND AGITATION FAVORABLE TO POLYMERIZATION, CONTINUOUSLY INTRODUCING VINYL CHLORIDE MONOMER AND A CATALYST THEREFOR INTO THE PRESSURE VESSEL, ESTABLISHING A DEGREE OF POLYMERIZATION IN THE POLYMERIZATION MASS, AT LEAST ABOUT 15%, AT WHICH THE LIQUID MONOMER PHASE SUBSTANTIALLY DISAPPEARS BY ABSORPTION IN THE GRAINS OF THE POLYMER AND THE POLYMERIZATION MASS IS SUBSTANTIALLY COMPOSED OF SOLID POLYMER SWOLLEN BY LIQUID MONOMER AND MONOMER VAPOR, AND INTERMITTENTLY DISCHARGING FROM THE VESSEL GRANULAR POLYMER IMPREGNATED WITH MONOMER AND HAVING A DEGREE OF POLYMERIZATION BELOW THAT AT WHICH THE GASEOUS MONOMER LOSES THE CHARACTERISTIC OF A SATURATED VAPOR, NOT SUBSTANTIALLY OVER 85%, BY INTERMITTENTLY AND BRIEFLY RELEASING QUANTITIES OF POLYMER FROM A POSITION BENEATH THE LEVEL OF THE POLYMERIZATION MASS AT WHICH LIQUID MONOMER IS NOT DISCHARGED WITH THE IMPREGNATED POLYMER, UTILIZING THE EXPANSION OF THE MONOMER ABSORBED BY THE GRAINS OF POLYMER TO EFFECT THE DISCHARGE.
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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) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |