US3763016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of rubbery polymers from solution
Assignee: Phillips Petroleum Co
•
Filing: 1971-05-28
•
Granted: 1973-10-02
•
Expires: 1991-05-28
Abstract
Abstract A process for recovering solvent from the overhead product produced by steam stripping a mixture of solvent and polymer in which noncondensed solvent vapors are contacted with water and introduced into a reservoir from which the liquid solvent is recovered.
Inventors
- 👤 R Hair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:01
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/34; B01D3/38; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 words
The method of claim 1 wherein said first reservoir is held at a temperature of about 175* F.
Claim 2
Dependent Claim
28 words
The method of claim 1 wherein said solution comprising water and solvent from said second reservoir is introduced into said condensate prior to entry into said first reservoir.
Claim 3
Dependent Claim
16 words
The method of claim 3 in which said first reservoir is held at about 175* F.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |