US3701764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the fractionation of polymers
Assignee: Union Carbide Corp
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Filing: 1968-08-26
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Granted: 1972-10-31
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Expires: 1988-08-26
Abstract
Abstract SEPARATION OF THE HIGHEST MOLECULAR WEIGHT FRACTION FROM POLYMERS CAN BE ACHIEVED BY THE SELECTIVE FORMATION IN THE HOMOGENEOUS PHASE OF SOLUBLE MOLECULAR COMPLEXES OF THE HIGHEST MOLECULAR WEIGHT FRACTION WITH SPECIFIC OTHER MACROMOLECULES AND THEREAFTER ISOLATING THE COMPLEXES FROM THE POLYMERS.
Inventors
- 👤 Bartholomew Hargitay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:34
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/04
Claims Analysis
Total Claims: 0
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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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |