US3640980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for the production of alfin polymers by polymerization of alfin monomers in an organic solvent and for recovering and recycling solvent
Assignee: Millennium Petrochemicals Inc
•
Filing: 1967-10-04
•
Granted: 1972-02-08
•
Expires: 1987-10-04
Abstract
Abstract A CONTINUOUS PROCESS FOR THE PREPARATION OF ALFIN POLYMERS IS PROVIDED, EFFECTING THE POLYMERIZATION OF THE MONOMER BY AN ALFIN CATALYST IN THE PRESENCE OF A MOLECULAR WEIGHT MODERATOR, TREATING THE ALFIN POLYMER REACTION MIXTURE WITH A SMALL AMOUNT CARBON DIOXIDE TO CONVERT ORGANOMETALLIC COMPOUNDS TO ORGANIC ACID SALTS, EXTRACTING THE ACID SALTS WITH WATER AND SEPARATING UNREACTED MONOMER, VOLATILE LOW POLYMER AND SOLVENT, AND THEREAFTER PURIFYING SOLVENT AND RECYCLING IT AND OPTIONALLY THE MONOMER FOR REUSE, AND WASHING AND DRYING THE ALFIN POLYMER.
Inventors
- 👤 Theodore B Baba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:33
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/001; C08F6/003; C08C; C08C2/00; C08C2/02; C08F36/00; C08F36/02; C08F36/04; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |