US3179642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of solvent from solvent polymer systems
Assignee: Huels AG
•
Filing: 1961-11-30
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Granted: 1965-04-20
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Expires: 1981-11-30
Abstract
No abstract record available.
Inventors
- 👤 Pflegerl Emmerich
- 👤 Schanzer Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:22
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/06; C08F; C08F6/00; C08F6/06; C08F6/12; Y; Y10; Y10S; Y10S159/00; Y10S159/10; Y10S159/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD OF SEPARATING A SOLVENT FROM A SOLUTION OF AN ORGANIC SOLVENT AND A POLYMER, WHICH METHOD COMPRISES CONTINUOUSLY DISPERSING SAID SOLUTION INTO SUFFICIENT HOT WATER AT A SUFFICIENTLY HIGH TEMPERATURE TO VAPORIZE SAID SOLVENT, AND SIMULTANEOUSLY PASSING THE RESULTANT DISPERSION UPWARDLY THROUGH A COLUMN TO PREVENT BACK MIXING BETWEEN SUBSTANTIALLY SOLVENT-FREED POLYMER AND FRESHLY INTRODUCED SOLUTION, AND WITHDRAWING SAID SUBSTANTIALLY SOLVENT-FREED POLYMER FROM THE TOP OF SAID COLUMN WHEREBY SAID SOLVENT-FREED POLYMER IS RECOVERED WITHOUT PASSING THROUGH A STICKY STATE.
Claim 2
Independent Claim
82 words
A METHOD OF SEPARATING A SOLVENT FROM A SOLUTION OF AN ORGANIC SOLVENT AND A POLYMER, WHICH METHOD COMPRISES CONTINUOUSLY DISPERSING SAID SOLUTION INTO SUFFICIENT HOT WATER AT A SUFFICIENTLY HIGH TEMPERATURE TO VAPORIZE SAID SOLVENT, AND SIMULTANEOUSLY PASSING THE RESULTANT DISPERSION UPWARDLY THROUGH A COLUMN TO PREVENT BACK MIXING BETWEEN SUBSTANTIALLY SOLVENT-FREED POLYMER AND FRESHLY INTRODUCED SOLUTION, AND WITHDRAWING SAID SUBSTANTIALLY SOLVENT-FREED POLYMER FROM THE TOP OF SAID COLUMN WHEREBY SAID SOLVENT-FREED POLYMER IS RECOVERED WITHOUT PASSING THROUGH A STICKY STATE.
References Cited (Backward Citations)
US2511833A
Cited
US3014849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |