Patent US4244699A successfully refreshed from Google Patents.
Patent US2943077A successfully refreshed from Google Patents.
US2943077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of ethylene and sulfur dioxide
Assignee: EIDP Inc
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Filing: 1956-11-01
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Granted: 1960-06-28
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Expires: 1976-11-01
Abstract
No abstract record available.
Inventors
- 👤 Jong Rudolf Bauke De
- 👤 Robinson Ivan Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:46
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A PROCESS FOR THE PREPARATION OF ETHYLENE SULFUR DIOXIDE COPOLYMERS WHICH COMPRISES POLYMERIZING ETHYLENE IN A REACTOR IN THE PRESENCE OF AN AQUEOUS SOLUTION OF BISULFITE IONS MAINTAINED AT A PH OF 5 TO 8 WITH A WATERINSOLUBLE, FREE-RADICAL FORMING POLYMERIZATION CATALYST, SAID AQUEOUS SOLUTION COMPRISING AT LEAST 25% OF THE REACTOR VOLUME, SAID CATALYST BEING EMPLOYED IN A QUANTITY OF 0.001 TO 10 PERCENT BY WEIGHT OF MONOMER, AT A TEMPERATURE OF 40 TO 250*C. AND A PRESSURE ABOVE 200 ATMOSPHERES, SAID BISULFITE ION BEING OBTAINED FROM BISULFITE-FORMING SALTS, SELECTED FROM THE CLASS CONSISTING OF SULFITES AND BISULFITES OF ALKALI AN ALKALINE EARTH METALS, SAID BISULFITE-FORMING SALTS BEING EMPLOYED IN A CONCENTRATION OF 20 TO 64% BY WEIGHT OF THE AQUEOUS MEDIUM, AND RECOVERING A SOLID COPOLYMER OF ETHYLENE AND SULFUR DIOXIDE.
Claim 2
Dependent Claim
133 words
A PROCESS FOR THE PREPARATION OF ETHYLENE SULFUR DIOXIDE COPOLYMERS WHICH COMPRISES POLYMERIZING ETHYLENE IN A REACTOR IN THE PRESENCE OF AN AQUEOUS SOLUTION OF BISULFITE IONS MAINTAINED AT A PH OF 5 TO 8 WITH A WATERINSOLUBLE, FREE-RADICAL FORMING POLYMERIZATION CATALYST, SAID AQUEOUS SOLUTION COMPRISING AT LEAST 25% OF THE REACTOR VOLUME, SAID CATALYST BEING EMPLOYED IN A QUANTITY OF 0.001 TO 10 PERCENT BY WEIGHT OF MONOMER, AT A TEMPERATURE OF 40 TO 250*C. AND A PRESSURE ABOVE 200 ATMOSPHERES, SAID BISULFITE ION BEING OBTAINED FROM BISULFITE-FORMING SALTS, SELECTED FROM THE CLASS CONSISTING OF SULFITES AND BISULFITES OF ALKALI AN ALKALINE EARTH METALS, SAID BISULFITE-FORMING SALTS BEING EMPLOYED IN A CONCENTRATION OF 20 TO 64% BY WEIGHT OF THE AQUEOUS MEDIUM, AND RECOVERING A SOLID COPOLYMER OF ETHYLENE AND SULFUR DIOXIDE.
References Cited (Backward Citations)
US2391218A
Cited
US2507526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |