US2920065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styrene polymerization initiated by sodium and promoter
Assignee: Standard Oil Co
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Filing: 1957-02-28
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Granted: 1960-01-05
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Expires: 1977-02-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Ralph W Myerholtz
- 👤 Donald E Burney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:35
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
THE METHOD OF POLYMERIZING A VINYL MONOMER CONSISTING ESSENTIALLY OF AN AROMATIC HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF STYRENE AND ALPHA-METHYLSTYRENE FROM A SOLUTION THEREOF IN A NON-POLYMERIZABLE HYDROCARBON SOLVENT AT A TEMPERATURE IN THE RANGE OF 20 TO 100* C. WITH AN EFFECTIVE AMOUNT OF A DISPERSED SODUIM IN THE RANGE OF ABOUT 0.01 TO ABOUT 0.5 PERCENT BY WEIGHT, BASED ON SAID MONOMER, TO SERVE AS A POLYMERIZATION INITIATOR, WHICH METHOD COMPRISES EFFECTING THE POLYMERIZATION IN CONTACT WITH AT LEAST ABOUT 901 WEIGHT PERCENT BUT LESS THAN 1.0 WEIGHT PERCENT BASED ON SAID VINYL MONOMER OF A DIHYDRIC ALCOHOL-DIALKYL ETHER WHEREIN THE ALKYL GROUPS CONTAIN NOT MORE THAN 4 CARBON ATOMS.
Claim 2
Independent Claim
114 words
THE METHOD OF POLYMERIZING A VINYL MONOMER CONSISTING ESSENTIALLY OF AN AROMATIC HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF STYRENE AND ALPHA-METHYLSTYRENE FROM A SOLUTION THEREOF IN A NON-POLYMERIZABLE HYDROCARBON SOLVENT AT A TEMPERATURE IN THE RANGE OF 20 TO 100* C. WITH AN EFFECTIVE AMOUNT OF A DISPERSED SODUIM IN THE RANGE OF ABOUT 0.01 TO ABOUT 0.5 PERCENT BY WEIGHT, BASED ON SAID MONOMER, TO SERVE AS A POLYMERIZATION INITIATOR, WHICH METHOD COMPRISES EFFECTING THE POLYMERIZATION IN CONTACT WITH AT LEAST ABOUT 901 WEIGHT PERCENT BUT LESS THAN 1.0 WEIGHT PERCENT BASED ON SAID VINYL MONOMER OF A DIHYDRIC ALCOHOL-DIALKYL ETHER WHEREIN THE ALKYL GROUPS CONTAIN NOT MORE THAN 4 CARBON ATOMS.
References Cited (Backward Citations)
US2327082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |